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figure 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.
500/25 = ?
Great. How much is 20 * 50 cents?
how many dollars is that?
you're not sure? how many cents in a dollar?
how much is 20 set of 2 quarters?
so, does it make sense to buy the special oil?
you can save $10 over the course of the trip. would you pay $16 for that?
for 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.
or how far you would have to drive with this oil for it to be worth it...
20 segments * x cents/segment = $16 — that's the break-even 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
ohhh okay i jus did 25/2 lol silly me