Calculate the amount of Rs. 2500 at 12% per annum for 8 years under simple interest.

Calculate the amount on Rs. 25000 at 8% per annum for 6 years under simple interest.

Calculate the amount on Rs. 20000 at 5% per annum for 5 years under simple interest (in Rs. )

What time will it take for a sum to amount to three times itself at 12% per annum under simple interest ?