Yes. Please calculate how much chips you would like (take a quick look at the spreadsheet) and send accordingly. To get an even amount of chips, you'll have to send a bit more or less than 50BTC exactly.
Looks like 52.802 for approx 660 chips. Look about right? (entered 51.48 in column B)
(660/12.8205128205128) * 1.025 + 0.035 = 52.802
That is correct, according to my calculations.