70%
7 out of ten slips will be a multiple of 2 or 3<span />
C = total cents
C = 30 + n
I think that's it. Hope it helps you.
4 goes into 20 5 times,
so you have 1/5 if you reduced it
1/5 is .20 or 20%
to check your work or for an easy way to do it, 1 divided by 5 or 4 divided by 20 which is also .20 or 20%
48.30 you move the decimal point back (to the left) to get 10 percent then since 5 is half of 10 to get the rest of the 15 percent you take half of ten percent witch is 5 and add the 10 and 5 percent to get the total 15 percent witch is 6.30 then add 6.30 for a total of what he paid