How do I solve this math problem?

Question

Herbert plans to use the earnings from his lemonade stand according to the table above, for the first month of operations. If he buys $70 worth of lemons, how much profit does he take home?

1.  $40
2.  $15
3.  $30
4.  $35.50
5.  $20

Answer 1

Let his earning be x

Given that,

Lemons: 35% of x = $70

Ttherefore, × = $70/ 35% = $200

Then,

Profits; 15% of $200 = $30