A dealer sells a radio at a gain of 10%. If he had bought it at 10% less and sold it for Tk. 132 less, he would have still gained 10%. The cost price of the radio is:

Cost Price = 100
Selling price = 100 + 10 = 110
New cost price after 10% less = 100 - 10 = 90
New selling price = 90 × (110/100) = 99
difference between two selling price = 110 - 99 = 11%
11% price is equal to Tk. 132
1% price is equal to Tk. 132/11%
100% price is equal to Tk. (132/11%) × 100
= 1200