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 one year ago
Arnold is about to go on a 500mile car trip. His mechanic recommends that he buy a special highway engine oil that will save him 50 cents in gas for every 25 miles of the trip. This new oil, however, will cost $20. Is it worthwhile for Arnold to buy the oil if he has a coupon for $4 dollars off the price?
 one year ago
Arnold is about to go on a 500mile car trip. His mechanic recommends that he buy a special highway engine oil that will save him 50 cents in gas for every 25 miles of the trip. This new oil, however, will cost $20. Is it worthwhile for Arnold to buy the oil if he has a coupon for $4 dollars off the price?

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whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.0figure out how many 25 mile segments there are in this trip. multiply that number by 50 cents. compare that number with $20$4. If it is larger, then using the special oil makes sense.

whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.0Great. How much is 20 * 50 cents?

whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.0how many dollars is that?

whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.0you're not sure? how many cents in a dollar?

whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.0how much is 20 set of 2 quarters?

whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.0so, does it make sense to buy the special oil?

whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.0you can save $10 over the course of the trip. would you pay $16 for that?

whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.0for a little puzzle to test your understanding, try to figure out how many cents per 25 miles you would have to save for it to be worth buying the special oil.

whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.0or how far you would have to drive with this oil for it to be worth it...

whpalmer4
 one year ago
Best ResponseYou've already chosen the best response.020 segments * x cents/segment = $16 — that's the breakeven point for purchasing the special oil $16/20 = $0.8 or 80 cents gas savings per 25 miles to make it worthwhile. for the second one, if we save 50 cents per 25 miles, and we need to save $16, the number of 25 mile segments to be driven is $16/50 cents = $16/$0.5 = 32 segments, or 32*25 = 800 miles

nikkijoy
 one year ago
Best ResponseYou've already chosen the best response.0ohhh okay i jus did 25/2 lol silly me
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