randRange( 10, 1999 ) / 10 roundTo( 5 , PCT / 100 )

Express PCT\% as a decimal.

SOLN

PCT\% literally means PCT per 100

PCT\% = \dfrac{PCT}{100}

To easily divide by 100, you can just move the decimal point two places to the left.

PCT \rightarrow roundTo( 5, PCT / 10 ) \rightarrow SOLN

So PCT\% = SOLN