Question

I can't understand
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Answer 1

        $\text{\huge \bf \underline{Answer:}}$

        $\text{It is given that a fruit seller bought bananas at Rs. 8.40 per dozen}$

        $\text{We know that, a dozen = 12 items}$

$\implies \: \text{Cost of one banana} = \dfrac{8.40}{12} = \text{Rs 0.7}$

$\implies \: \text{Cost Price (C.P) = Rs 0.7}$

        $\text{We must find the selling price (S.P) such that the fruit seller gets a}\\\text{15}\% \text{ profit}$

$\implies \: \text{Profit}\% = 15\%$

        $\text{We know that Profit}\% = \dfrac{\text{S.P} - \text{C.P}}{\text{C.P}} \times 100$

$\implies \: 15 = \dfrac{\text{S.P}- 0.7}{0.7} \times 100$

$\implies \: 15 \times 0.7 = (\text{S.P}- 0.7) \times 100$

$\implies \: 10.5 = (\text{S.P}- 0.7) \times 100$

$\implies \: \dfrac{10.5}{100} = \text{S.P}- 0.7$

$\implies \: 0.105 = \text{S.P}- 0.7$

$\implies \: 0.105 + 0.7 = \text{S.P}$

$\implies \: \text{Rs 0.805} = \text{S.P}$

        $\text{This is the S.P per one banana, the question has asked us S.P}\\\text{per 100 bananas}$

$\implies \: \text{S.P per 100 bananas} = \text{S.P} \times 100$

$\implies \: \text{S.P per 100 bananas} = \text{0.805} \times 100$

$\implies \: \text{S.P per 100 bananas} = \text{Rs 805}$

$\implies \: \boxed{\boxed{\text{The fruit seller must sell the bananas at Rs 805 per 100 bananas}}}}$