Question

Rahul bought a mobile and paid 3/4of the cost price in cash. He decided to pay the rest of the amount in 8 monthly installment of rupee 600 each .find the cost price of the mobile.

Answer 1

Let the cost be X rupees then according to question,

X = 3 X/ 4+ 600 * 8

X /4 = 4800

X = 19200 rupees

So the total cost was 19200 rupees.

Answer 2

The cost price of mobile is Rs 19200

Solution:

Let the cost price of mobile be "x"

Rahul bought a mobile and paid 3/4 of the cost price in cash

$Paid = \frac{3}{4}x\\\\Remaining = 1 - \frac{3}{4}x\\\\Remaining = \frac{1}{4}x$

He decided to pay the rest of the amount in 8 monthly installment of rupee 600 each

$8 \times 600 = \frac{1}{4}x\\\\x = 4800 \times 4\\\\x = 19200$

Thus cost price of mobile is Rs 19200

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