. 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.
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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
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