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 an instrument
is Rs 150, find the
marked price of the
instrument.
​

Answer 1

Answer:

Rs.937.50

Step-by-step explanation:

Let C.P of instrument =Rs.100

Profit =25% of Rs.100=Rs.25

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, M.P=Rs. 100/80 * 750 = Rs.937.50

Thus, marked price of the instrument =Rs.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