We have a question: Emma is planning a dinner party, so she went to a shop to buy the products she needs. She bought 8 kg of cheese and 7 kg of vegetables. One kilogram of cheese costs $4 and one kilogram of vegetable costs is $2 more expensive. How much did she pay for her shopping?
And an answer: 74
So how you got the answer?
Emma payed 8 kg * $4 / kg = $32 for the cheese. The cost of one kilogram of vegetable is $4 + $2 = $6. So Emma payed 7 kg * $6 / kg = $42 for vegetables. In total Emma payed $32 + $42 = $74 for her shopping.

We have a question: Corna wants to buy a shirt. The store buys the shirt for $20, but charges 30% for profit. However, the shirt is on sale for 50% off the selling price. What is the price now?
And an answer: 13
So how you got the answer?
First find how much the store makes in profit: $20 * 0.30 = $6 for profit. Then find the regular selling price: $20 + $6 = $26 total price. Then multiply the regular price by the discount to get $26 * 0.50 = $13 for the final price.

We have a question: John ends up damaging his hearing aids. He needs to replace both of them. They cost $2500 each. Insurance covers 80% of the cost. How much does he personally have to pay?
And an answer: 1000
So how you got the answer?
The cost of the hearing aids is $2500 * 2 = $5000. So insurance covers $5000 * .8 = $4000. That means it cost him $5000 - $4000 = $1000.