UPSC Civil Services 2016 Prelims General Studies Paper II

Marked price (M.P.) of toy =₹770
Discount =10% of MP=

10

100

×770=₹77
Price after discount =₹(770−77)=₹693
Let cost price (C.P.) of toy be ₹ x.
According to Question,
693−x=

10

100

of x
⇒693−x=0.1x
⇒1.1x=693⇒x=630
∴ cost price of the toy =₹630
MP=770
SP after discount =

90

100

×770
CP getting 10% gain =

100

110

×

90

100

×770=630