The price of a motorbike is $1,500. how much do you need to pay if it was 10% off and you had a 30% coupon?

Firstly we need to find out how much is 10% from $1,500:

$1500 * 10% =
= 1500 * 10/100 =
= 1500 * 1/10 =
= 1500 / 10 =
= 150

So the price after 10% discount would be $1,500 - $150 = $1,350. Now if you have 30% coupon, we need to find out how much is 30% from $1,350:

$1350 * 30% =
= 1350 * 30/100 =
= 1350 * 3/10 =
= 4050 / 10 =
= 405

It means that you'll pay for the discounted product $1,350 - $405 = $945.

Ok, the motorbike's price including the 10% discount is $1350.

30% of 1350 - 
10% = 135
x3 = 30% = 405

1350 - 405 = $945

that is your final answer.