Portland Home Mortgage Guide

I am in the mortgage industry and need to know how to do the following on this calculator that was given to me. I need to get a percentage of a loan amount, and then subtract from that amount a few numbers. Example (number x 85%) = Answer, Answer – number – number. I can get the 85%, but can’t find a way to subtract a few sets of numbers from that result. It does not have an option for brackets or the like. It’s an older desktop calculator. Do you know what I found? Does it have brackets, you can do the multiplication inside the brackets, then do your subtraction. . hope this helps.