Carla's order at Mcdonald's costs $7.50, but she has a coupon for $2.50. If she gets an additional 20% discount for being a senior citizen, how much does she pay for her order in dollars total? Give the rationale and then the answer.
Let's think step by step. First subtract the coupon amount from the price of the food: $7.50 - $2.50 = $5.00. Then subtract 20% from 100% to find out what percentage of the reduced price Carla pays: 100% - 20% = 80%. Now multiply the price after the coupon by the percentage Carla pays to find the final price: $5.00 * .8 = $4.00.. The answer is: 4.

A state fair charges $5 for a ticket. Two-thirds of the people who buy a ticket will buy deep-fried fair food for $8, one quarter will go on a ride for $4, and one eighth will spend $15 on a souvenir. The fair made $2520 from tickets. How many dollars did they make in all? Give the rationale and then the answer.
Let's think step by step. The fair made $2520 from tickets, so they had 2520 / 5 = 504 people attend the fair. Two - thirds of those people will buy food, so 504 * 2 / 3 = 336 people will buy food. The fair will make 336 * 8 = $2688 from food. A quarter of the people will go on a ride, so 504 / 4 = 126 people will go on a ride. The fair will make 126 * 4 = $504 from rides. An eighth of the people will buy a souvenir, so 504 / 8 = 63 people will buy souvenirs. The fair will make 63 * 15 = $945 from souvenirs. In all, the fair will make 2520 + 2688 + 504 + 945 = $6657.. The answer is: 6657.

If Stu has 9 books and Albert has 4 times as many books as Stu, how many books do Stu and Albert have in total? Give the rationale and then the answer.
Let's think step by step. Albert has 4 * 9 books belonging to Stu = 36 books. So the pair have a combined total of 36 books belonging to Albert + 9 books belonging to Stu = 45 books.. The answer is: 45.