Aperson owns two shops. this year the telephone bill for the first job was $640 less than four times a telephone bill for the second shop. the total telephone expense for both shops was $3720. what was the cost of each shops telephone service for the year?

F=bill for first shop=4S-$630; S=bill for second shop

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F+S=$3265 Substitute for F

4S-$630+S=$3265

5S=$3895

S=$779 ANSWER 1: The bill for the second shop was $779

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F=4S-$630

F=4($779)-$630

F=$3116-$630=$2486 ANSWER 2: The bill for the first shop was $2486.

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CHECK:

F+S=$3265

$2486+$779=$3265

$3265=$3265

explanation:

$9.89

step-by-step explanation:

9.90 = p x .06 x .25 (3/12 changed to a decimal)

9.90 = p x 0.015

9.90 - 0.015 = p

9.89 = p