In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

Let me give you an example: Article: Homework can put you in a badmood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Answer: whether mood affects their learning ability
The answer to this example can be: Researchers did experiments on kids in order to find out _ .
Here is why: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

OK. solve this:
Article: Canyoning The sports of canyoning explore the high-energy environment where water meets rock on the coast, or in river canyons. Protected by wetsuits and helmets , people jump from cliffs and waterfalls and explore caves and river canyons that would not normally be arrived at. It was pioneered in the U.K. by TYF Adventure (01437 721611, www.tyf.com) and several thousand people leap from the cliffs near St David's each year. A half day canyoning trip costs PS50 (PS30 for children under 16). Scuba diving Diving is not popular with British people. The challenges of wild waters are greater because the water is colder and not clear enough, but the coasts of Cornwall, Wales and Scotland have some of the best wreck diving in the world. The British Sub Aqua Club (0870 112 9133 www.bsac.com) and the Professional Association of Diving Instructors (01580 819688 www.padi.com) run courses teaching the important skills right up and to instructor level. Surfing The best surfing places in the UK are on the southwest coast where it is warmer and the surf is relatively steady, particularly in Cornwall. The best time of year to surf in the UK is late summer and autumn when water temperatures are at their mildest. The British Surfing Association (01479 861256 www.britsurf.co.uk) has a list of famous surf schools around the country. Rock climbing The most popular natural rocks in Britain include the Peak District, the Lake District, coastal regions, while vast areas of Scotland are a climber's paradise . Climbing courses and climbing walls can be located on the website of the British Mountaineering Council (0870 010 4878, www.thebmc.co.uk) which offers a series of short films that take the new climber through a step-by-step guide to visiting a climbing wall for the first time.
Answer: PS 260
Answer:
If a couple with their child of 15 join in Canyoning for a day, they will pay _ .