twoDecimals method should return a string version of
val rounded to exactly two decimal places. There should always be exactly two decimals, even when one or both are zero.
twoDecimals(1.23456) => "1.23" twoDecimals(1.0) => "1.00" twoDecimals(1234.7777) => "1234.78"
You're probably going to want to use String.format() for this. It's very similar to
printf except that it returns the string instead of outputting it.
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