Question

sravya brought a watch for rupees 480 she sold it to ridhi at gain of 6 one by 4 % ridhi sold it to Divya at a gain of 10 % how much did Divya pay for it

Answer 1

Cost price of watch (for Sravya) = Rs 480 

 Recall selling price, 

 

 SP of watch is Rs 510 That is cost price of watch (for Ridhi) = Rs 510 Gain = 10% 

 SP of watch (to Divya) is Rs 561 Hence Divya has to pay Rs 561 to purchase the watch.

Answer 2

$cost \: price = 480 \\ gain = \frac{25}{4} \\ gain \: in \: rupees = \frac{25}{4} \times \frac{1}{10 } \times 480 \\ sp = cp + gain \\ = 480 + 30 = 510 \\ cp \: of \: ridhi \: = 510 \\ gain = 5\% \\ gain \: in \: rupees = \frac{10}{100} \times 10 \\ gain = 51 \\ p \\ sp = cp + gain \\ = 561$