Question

a farmer bought 100 hens for ₹4000. He sells 20 of them at a gain of 5%. At what gain percent he sell the remaining hens so as to gain 20% on the whole​

Answer 1

Answer:

Proper Answer

$100 \: hens = 400 \\ 1hen = 400 \div 100 = 4 \\ for \: 20 \: percen \: of \: gain \: selling \: price = 400 + 400 = \frac{20}{100} \\ selling \: price = 480 \\ selling \: price \: of \: 1 \: hen \: at \: 5 \: percent \: of \: gain \: = \: 4 + 4 \times \frac{5}{100} = 4.2 \\ \: s \: p \: of \: 20 \: hens \: at \: 5 \: percent \: = 20 \times 4.2 = 84 \\ remaining \: hens \: = 100 - 20 = 80 \\ desind \: sellng \: price \: for \: 20 \: percent \: gain \: = \: 480 - 84 = 396 \\ cost \: price \: of \: 80 \: hens \: 4 \times 80 = 320 \\ gain \: percent \: = \: \frac{sp - cp}{cp} \times 100 = \frac{396 - 320}{320} \times 100 \\ = 23.75 \\ so \: final \: answer \: is \: = 23.72 \: percent$

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