Suppose you are starting an office-cleaning service. You have spent $315 on equipment. To clean an office, you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even?

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Answer 1 · 2018-07-12T05:03:49

Number of offices to be cleaned to cover the cost of equipment #=15#

Cost of equipment #=$.315#
Cost of supplies #=$.4#
Charge per office #=$.25#
Number of offices to be cleaned to cover the cost of equipment #=x#

Then -

#25x-4x=315#

#21x=315#

#x=315/21=15#

Number of offices to be cleaned to cover the cost of equipment #=15#