She underestimated by 60 cents. To get this answer all you need to do is multiply 1 dollar times 12 which is $12 and then multiply $.30 by 12 and that gives you $3.60. Then you add the $12 to the $3.60 and that gives you $15.60 which is 60 cents over the estimation.
Answer:
-2 11/35
Step-by-step explanation:
Hope it helps :)
It would be something that looks like this:
((6390 * 0.17)/365) x 3
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