Question: A trolley driver picked up 10 people on his 1st stop. On the next stop, 3 people got off and twice as many people from the 1st stop got on. On the third stop, 18 people got off and 2 got on. How many people are currently on the trolley?
Answer: Step-by-step reasoning process: Between the trolley driver and his first 10 customers, there are 1 + 10 = 11 people are currently on the trolley. On his first stop, 10 people go on and twice as many people got on at the second stop so 10 * 2 = 20 people got on at the second stop. So at the second stop he had 11 people on board, 3 got off and 20 got on so he now has 11 - 3 + 20 = 28 people. At his third stop 18 people got off and 2 got on so in total there are 28 - 18 + 2 = 12 people on the trolley.
So the answer is 12.

Question: Bernie loves eating chocolate. He buys two chocolates every week at the local store. One chocolate costs him $3. In a different store, there is a long-term promotion, during which each chocolate costs only $2. How much would Bernie save in three weeks, if he would buy his chocolates in this store instead of his local one?
Answer: Step-by-step reasoning process: During three weeks, Bernie buys 3 * 2 = 6 chocolates. In the local store, he pays for them 6 * 3 = $18. If Bernie would buy the same chocolates in the different store, he would pay 6 * 2 = $12. So Bernie would be able to save 18 - 12 = $6.
So the answer is 6.

Question: Miriam currently has 30 marbles, but she used to have more. Miriam gave her brother 60 marbles, gave her sister twice that amount and gave her friend Savanna three times the amount she currently has. How many marbles did Miriam start with?
Answer: Step-by-step reasoning process: If Mariam remains with 30 marbles after giving her brother 60 marbles, she had 30 + 60 = 90 marbles. Mariam's sister receives twice as many marbles as her brother, a total of 2 * 60 = 120 marbles. The total number of marbles before giving any to her brother or sister is 120 + 90 = 210. Savannah is to receive three times as many marbles as Mariam has to remain with, a total of 3 * 30 = 90 marbles. Before giving out any marble, Mariam has 210 + 90 = 300 marbles.
So the answer is 300.

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?
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Step-by-step reasoning process: The cost of the hearing aids is $2500 * 2 = $5000. So insurance covers $5000 * .8 = $4000. That means it cost him $5000 - $4000 = $1000.
So the answer is 1000.