Question

. Ball point pens were sold at a loss of 20%. If they hadbeen sold at ₹70 more, there would have been a gain
of 10/3%. Find the cost price.​

Answer 1

Step-by-step explanation: 300

Let cost price = x

loss % = 20

Loss = 20x/100 = x / 5

Selling price = Cost price - loss

= x - x / 5 = 4x/5

If they had been sold at Rs 70 more

New Selling price = 4x/5 + 70 ➡️ 1

profit % = 10/3

Profit = 10x/300

= x/30

New selling Price = Cost price + Profit

= x + x/30 = 31x/30 ➡️ 2

From eq 1 and 2

4x/5 +70 = 31x/30

31x/30 - 4x/5 = 70

7x/30 = 70

x =300