To determine the price of the keyboard with the coupon, we need to know how much Tiana spent. Let's call the original price of the keyboard "x".
According to the coupon, Tiana will receive a discount of $150 for every $500 spent. So, if she spends x dollars, she will receive a discount of (x/500) * $150.
The price of the keyboard with the coupon will then be x - (x/500) * $150.
Since the original price is not specified, we cannot determine the exact price of the keyboard with the coupon.