Question 363523
a person buys a horse for 15 pounds, after one year he sells it for 20 pounds. after one year, again he buys the same horse at 30 pounds and sells it for 40 pounds what is the profit for that person? 

Solution: In the first year the profit is 20-15 = 5 pounds
In the second year the profit is 40-30= 10 pounds
so total profit = 5 +  10 = 15 pounds
I think this makes sense