$392. My breakdown as below.
Geekermart price - $655
Shop coupon - $15
Cart coupon - $50
Qpoints - $5
Qcoins wallet balance - 109 qcoins
Payable - $585 or 403.65 qcoins
Bought 3x 100 qcoins at 10% off with AMEX. Used 103.65 qcoins from my wallet to make nice round off.
Without my qcoins balance, i think at most can get at $529.
My formula below:
But i feel there is something a bit off. If my payable is just 300qcoins, it should be $127.80 x3 = $383.40. The $392 is based on all discounts added together and then selling price minus discount. So, im not sure which to follow though.