human
Carlos is planting a lemon tree. The tree will cost $90 to plant. Each year it will grow 7 lemons, which he can sell for $1.5 each. It costs $3 a year to water and feed the tree. How many years will it take before he starts earning money on the lemon tree?
assistant
How many lemons does Carlos sell each year? ** He makes $10.5 selling lemons each year because 7 x 1.5 = <<7*1.5=10.5>>10.5
How much money does Carlos earn from the lemon tree each year? ** He earns $7.5 each year from the lemon tree because 10.5 - 3 = <<10.5-3=7.5>>7.5
How many years will it take before he starts earning money on the lemon tree? ** It will take 12 years to earn enough to pay off the tree because 90 / 7.5 = <<90/7.5=12>>12
How many years will it take before he starts earning money on the lemon tree? ** He will make money in year 13 because 12 + 1 = <<12+1=13>>13
#### 13