Since 100/5 = 20 all we do is multiply by 20, round up to the nearest whole number, and then divide by 20.
(To round up in MySQL use CEIL)
Example for $1.03:
1.03 * 20 = 20.60
CEIL(20.60) = 21.0000
21 / 20 = 1.0500
NOTE: I also round…
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