How to multiple a two digit number then round it by the nearest ten

Rules for rounding:

The rules for rounding are that if the number has the ones place as anything that is 5 or above, you round up to the nearest ten. If it is 4 or below, you round down.

Example: 55, You would round up to 60.

67, you would round up to 70.

43, you would round down to 40.

i think the amount would be $140.62