Correct Answer - Option 3 : Rs. 5340
Given:
C.P of 35 watches = Rs. 4200
Profit on 25 watches = 30%
Profit on 10 watches = 20%
Formula used:
Profit % = (Profit)/(C.P) × 100
S.P = [(100 + P%) × C.P]/100
Calculation:
Cost price of 1 items = Rs. 4200/35 = Rs. 120
S.P of 25 items = (130/100) × 120 = Rs. 156
⇒ S.P of 25 items = 25 × 156 = Rs. 3900
S.P of 10 items = (120/100) × 120 = Rs. 144
⇒ S.P of 10 items = 10 × 144 = Rs. 1440
Total S.P of 35 items = Rs. (2340 + 1440) = Rs. 5340
∴ Total S.P of 35 watches is Rs. 5340.