num: Display a number in Dollars
In kbrevoort/kpbkh: Ken's Knitr Helper

This function accepts a single number and converts it into dollars for display in the monitoring reports.

1	num(x, use_cents = FALSE, digits, decimals)

`x`	The numeric value to be conferted (must be length 1)
`use_cents`	Should 2 digits to the right of the decimal be used (default = FALSE)
`digits`	Specify the number of digits to use (includes left and right of decimal)
`decimals`	Specifies the number of digits to the right of the decimal