Question

bob sold his watch for rs 190 thus bearing a loss of 5% . the cost price of watch is ?

Answer 1

SP=190
Loss =5%
CP = Sp +loss
CP = 190 + 5%of CP
CP - 5/100* CP =190 (reciprocal)
(100CP - 5CP) / 100 = 190
95CP/100 = 190
19CP / 20 = 190
19 CP =3800
CP = 3800/19 = 200

Answer 2

Given Selling price = 190. Loss = 5%.

we know that Cost price = 100/ (100 - Loss%)) * SP

                                         = 100/(100 - 5%)) * 190

                                        = 100/95 * 190

                                        = 200.


The cost price of the watch = 200 rupees.

Hope this helps!