Build a 1 Page Mobile Friendly Website

We need a simple math calculator designed with managing money. We want the calculator easy to access on cell phone. We may want app also, but want it done quickly. We are looking to measure our "Total Money" in terms of units. 5% of "Total Money" equals 1 unit. We also want units in sizes of .25, .5, .75, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 1. Total Money: ENTER__$__10,000_________ 2. % of "Total Money" = 1 unit - for example: 5% of "Total Money" equals 1 unit .25= $125 .5= $250 .75= $375 1 = $500 2 = $1000 3 = $1,500 4 = $2,000 5 = $2,500 6 = $3,000 7 = $3,500 8 = $4,000 9 =$4,500 10= $5,000 Very simple. I just need be able ENTER my "Total Money" and ENTER my percentage to bankroll. And I just need the results .25 - 10 units displayed nicely. MUST BE A MOBILE WEBSITE OR PHONE APP We are not looking to spend lots of money on simple mobile website. Please give us your best bid and proof of past work. We will hire quickly and pay fast!! THANK YOU, MANAGEMENT