Sixty

Sixty percent of one-fifteen of the total is equal to thirty. What are two percent of the total?

Correct result:

p =  15

Solution:

$0.60 \cdot \ (1/15) \cdot \ c=30 \ \\ 0.04c=30 \ \\ \dfrac{ 1 }{ 25 }c=30 \ \\ c=750 \ \\ \ \\ p=0.02 \cdot \ c=0.02 \cdot \ 750=15$

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