In your previous thread you are selling a 1000 dollar Starbucks giftcard at 45% face value.
So of that 750 dollars in giftcards that you want to pawn, the fair market value for that is 45% of the face value of 750$ in giftcards. 0.45 x 750 = 337.5, you are approved for 70% of this amount.
So here's the math 0.45 x 750 = 337.5 and 70% of 337.5 would be a loan of 253.125 dollars in BTC equivalent. The interest will be 25.3125 dollars In BTC equivalent due after 2 weeks.