A shopkeeper sells transistors at 15% above its cost price. If he had bought it at 5% more than what he paid for it and sold it for ? 6 more, he would have gained 10%. The cost price of the transistor is?

47/10000 = .0047

.02 =(2/100) x 100% =2%

Let N / 11 = 233
Then, N = 233 x 11 = 2563
? Missing digit is 5.

121012 = 12 x 10084 + 4
? remainder = 4

We have the important relation, More work, More time (days)
? A piece of work can be done in 6 days.
? Three times of work of same type can be done in 6 x 3
= 18 days

? = 750.0003 ÷ 19.999
? ? ? 750 ÷ 20
? ? ? 375 ? 38

Subtract 20, 25, 30, 35, 40, 45 from successive numbers. So 0 is wrong.