Hema bought two pairs of jeans for ₹ 1450 each. She sold one of them at a gain of 8% and the other at a loss of 4%. Find her gain or loss per cent in the whole transaction.
CP of first jeans $=₹ 1,450$
Profit $=8 \%$ of $\mathrm{CP}=\frac{8}{100} \times 1450=₹ 116$
SP of first jeans $=₹ 1,450+₹ 116=₹ 1,566$
CP of second jeans $=₹ 1,450$
Loss $=4 \%$ of $\mathrm{CP}=\frac{4}{100} \times 1450=₹ 58$
SP of second jeans $=₹ 1450-₹ 58=₹ 1,392$
Total CP of two jeans $=\mathrm{CP}$ of first jeans $+\mathrm{CP}$ of second jeans $=₹ 1,450+₹ 1,450=₹ 2,900$
Total SP of two jeans $=$ SP of first jeans $+$ SP of second jeans $=₹ 1,566+₹ 1,392=₹ 2,958$
Here, Total SP of two jeans $>$ Total CP of two jeans.
Gain $=$ Total SP of two jeans $-$ Total CP of two jeans $=₹ 2,958-₹ 2,900=₹ 58$
$\therefore$ Gain $\%=\frac{\text { Gain }}{\text { Total CP of two jeans }} \times 100 \%=\frac{58}{2900} \times 100 \%=2 \%$
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