An average of 1.8% of Apex Alarm systems need a battery replacement after 3 years in operation. Seventy-two battery replacements are needed in the next three years. What is the best estimate of how many Apex Alarm systems were sold?

3 answers

.018x = 72
solve for x

I got 4000 is that right?

yes

check it by taking 1.8% of it

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