If A + B + C = 400 in which A is 40% and B is 45%, then the exact quantity of C in the whole is :

1. 160

2. 60

3. 180

4. 15%

A number is decreased by 20%. If the resulting number is 800, the original number is :

1. 640

2. 960

3. 1000

4. 600

Evaluate :

9.3% of 500 - 4.8% of 250 - 2.5% of 240

A number is increased from 125 to 150; find the percentage increase.