Problema Solution
jeffrey decides to buy one of two used cars. car a costs $2,400 and will cost $50 a week on average in gas. Car b costs $3,000, but is more fuel efficient, and should cost Jeffrey $30 a week on average in gas. After how many weeks will car B be the better purchase?
Answer provided by our tutors
let x = the number of weeks
car A will cost: 2,400 + 50x
car B will cost: 3,000 + 30x
car B is better purchase means:
3000 + 30x < 2400 + 50x
by solving we find
x > 30
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After 30 weeks car B will be better purchase.