Answer : The money he save in one year would be, $177.009
Explanation :
First we have to calculate the cost of 1 incandescent bulbs.
Cost of 1 incandescent bulbs = Cost of single bulb × Cost of annual operating
Cost of 1 incandescent bulbs = $1.47 × $32.86
Cost of 1 incandescent bulbs = $48.3042
Now we have to calculate the cost of 10 incandescent bulbs.
Cost of 1 incandescent bulbs = $48.3042
Cost of 10 incandescent bulbs = 10 × $48.3042
Cost of 10 incandescent bulbs = $483.042
Now we have to calculate the cost of 1 CFL bulbs.
Cost of 1 CFL bulbs = Cost of single bulb × Cost of annual operating
Cost of 1 CFL bulbs = $3.99 × $7.67
Cost of 1 CFL bulbs = $30.6033
Now we have to calculate the cost of 10 CFL bulbs.
Cost of 1 CFL bulbs = $30.6033
Cost of 10 CFL bulbs = 10 × $30.6033
Cost of 10 CFL bulbs = $306.033
Money he save in one year = Cost of 10 incandescent bulbs - Cost of 10 CFL bulbs
Money he save in one year = $483.042 - $306.033
Money he save in one year = $177.009
Thus, the money he save in one year would be, $177.009
