1. Convert that USD to INR (usually consider settlement date conversion rate).
440 USD = 35928 Rs. (assuming 1 USD = 81.65 Rs.)
+
2. Add markup fee and corresponding GST
(amount × markup fee of that card) + GST
35928 x 3.5% = 1257.48 + 18% GST = 1483.83 (4.13%)
3. Amount you're paying overall in INR.
~ 37422 Rs. you're paying.
SBI Cashback mostly will give 5% unless that certification site report as Utility in that case 1%.
Note: Same process for both Credit and Debit Cards, and not all Credit and Debit cards charge 4.13%. There are cards with 0% markup-fee.