If the total cost of 73 articles having equal cost is Rs. 5110 and the total selling price of 89 such articles is Rs. 5607, then in the transaction, there will be = ?

According to the question,
Cost price of 73 articles are
= Rs. 5110
Cost price of 1 articles are
$$\eqalign{ & = \frac{{5110}}{{73}} \cr & = {\text{Rs}}{\text{. 70}} \cr} $$
Selling price of 89 articles are = Rs. 5607
Selling price of 1 articles is
$$\eqalign{ & = \frac{{5607}}{{89}} \cr & {\text{ = Rs}}{\text{. 63}} \cr} $$
Loss = Cost price - Selling price
Loss = 70 - 63 = Rs. 7
$$\eqalign{ & {\text{Loss}}\% = \frac{7}{{70}} \times 100 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 10\% \cr} $$