Question

Vinnie bought 50 kg tomatoes 5 kg were foung rotten and she threw them away .she sold the remaining and charged 4 kg as much as she paid for 5 kg . fing the gain or loss percent ?

Answer 1

Assume that Vinnie payed x for 5 kg, then she spent
50 10x = 10x.
After she threw away some tomatoes it remained
50 − 5 = 45 kg.
 Solving them she got $\frac{45}{4} x$  = 11, 25x.

Thus, the gained $\frac{11,25x}{10x} 100$% = 12, 5%.
Answer. Vinnie gained 12, 5%.