Peak rate of a phone company.

The peak rate of a phone company is $.22 per minute, and the off-peak rate is $.11 per minute. Find the saving for a 16-minute phone call if it was made during off-peak time as opposed to peak time. Round to the nearest hundreth.

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If we make a call at a peak time, the call rate is $.22 per minute.
So, if the 16 minute call is made at a peak time, the charges need to be paid will be :-

(A) .22*16 = $ 3.52.

If we make a ...