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Earlier discussion
1 older comment kept for context.
Doctor Strange
200 mangoes at 4 for N2.50
\(\implies\) Total cost price = \(\frac{200}{4} \times N 2.50\)
= N 125.00
Since 30 mangoes got spoilt \(\implies\) Left over = 200 - 30
= 170 mangoes
170 mangoes at 2 for N 2.40
\(\implies\) Total selling point = \(\frac{170}{2} \times N 2.40\)
= N 204.00
Profit : N (204.00 - 125.00) = N 79.00
% profit = \(\frac{79}{125} \times 100%\)
= 63.2% profit.