Q1 of 59 Page 147

The time in which simple interest on a certain sum be 0.15times the principal at 10% per annum is:

Given: Let Principle be ₹P, Rate = 10% per annum, Simple Interest = ₹ 0.15 P

⇒ t = 1.5 years

If ₹ 1,600 is the commission at 8% for goods sold through abroker, the selling price of the goods is:

The simple interest on ₹ 5,000 at 2% per month for 3 months is:

The principal that yields a simple interest of ₹ 1,280 at 16%per annum for 8 months is:

A time interval of 3 minutes and 20 seconds is wrongly measured at 3 minutes and 25 seconds. What is the percentage error?

Questions · 59

9. Commercial arithmetic

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