help with math due in an hour

Now that the original selling price is known to be 

SP0 = $103.77,

 we can calculate the selling price after the markdown of 15%. This will be calculated using the following formula.

SP1 = SP0(100% − markdown%)

As before, the percentages must first be converted to decimals. The first markdown was 15%, so we have 

100% − markdown% = 100% − 15% = 85%.

 Converting 85% to a decimal gives  .

Substitute this decimal value and 

SP0 = $103.77

 to find the selling price (in $) after the first markdown, rounding the result to the nearest cent.

SP1	=	SP0(100% − markdown%)
	=	$103.77
	=	$