You and your friends have decided to build a skateboard ramp behind your house. You have already purchased $500 in materials and are considering renting an electric saw. It costs $20/hour to rent an electric saw. You estimate it will take 6 hours to build the ramp. If you decide to use your saw, which is a handsaw, you will not have to pay anything to rent an electric saw, but it will take 15 hours to build the ramp. Regardless of the decision, you will need to ask for time off from your job, which pays $8/hour.

Hand saw is cheaper.

Explanation:

Given:

Material cost = $500

Electric saw cost rent per hour = $20

Building hour from electric saw = 6 hour

Building hour from hand saw = 15 hour

Time off pay from job = $8/hour

Computation of total cost from Electric saw :

Total cost from Electric saw = Material cost + Renting cost of electric saw + Time of from job

Total cost from Electric saw = $500 + (6 × $20) + (6 × $8)

Total cost from Electric saw = $500 + $120 + $48

Total cost from Electric saw = $668

Computation of total cost from hand saw :

Total cost from hand saw = Material cost + Time of from job

Total cost from hand saw = $500 + (15 × $8)

Total cost from hand saw = $500 + $120

Total cost from hand saw = $620

Hand saw is cheaper.

answer: it is a cellular phone