Question

A dealer of scientific instruments allows 20% discount on the marked price of the instruments and still makes a profit of 25%. If his gain over the sale of a instrument is Rs.150, find the marked price of the instruments

Answer 1

25% of the cost price = 150

Therefore, cost price = 150×4 = 600


selling price = 600 + 150 = 750


Marked price 

=

750

×

100

80

=

937.50

=750×10080=937.50

Answer 2

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GIVEN

• Let C.P of instrument = Rs.100
• Profit = 25% of Rs.100=Rs.25

SOLUTION

If profit is Rs.25,

• C.P = Rs.100

If profit is Rs.150, C.P

• =Rs.100/25×150
• =Rs.600

S.P of the instrument

• = Rs.600+Rs.150
• = Rs.750

Let M.P of the instrument be Rs. 100

If S.P is Rs.80,

• MP = Rs.100/80×750
• MP = Rs.937.50

★ Thus, marked price of the instrument =Rs.937.50