Mark must buy four new tires for his car. He is considering buying tires that ar

Question

Mark must buy four new tires for his car. He is considering buying tires that are $25 a piece more than his regular brand, because the higher priced tires are supposed to increase his miles per gallon by 20%. If the tires are good for 48,000 miles and Mark drives an average of 1000 miles per month, gas costs $2.50 per gallon over the next 4 years, and Mark's car gets 30 miles to the gallon now (on the old tires), should Mark purchase the more expensive tires? Note: please show me how u got the answer.

Explanation / Answer

Mark will drive 48,000 miles in next 4 years
gallons of gas needed (regular brand) = 48,000 / 30 = 1600 gallons
Total cost of gas = 1600 * 2.50 = $4,000
On regular brand tires Mark will spend $4,000 on gas.

New tires give 20% more miles to the gallon = 30 + 30*0.2 = 36 mpg
Gallons of gas needed (expensive tires) = 48,000 / 36 = 1333.333 gallons
Cost of gas = $3333.33
On Expensive tires Mark will spend $3,333.33 on gas. Plus he will pay $100 more (4*25 for 4 tires) he will still save $566.67.

Mark Should purchase Expensive Tires.

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