American Express®Cards both earn 1 base. Point and 0.25 bonus Points (for a total of. 1.25 Points) per each dollar in Net Purchases. • Bank of America Rewards™ Platinum. American Express® Cards earn 1 base. Point and 0.5 bonus Points (for a total of. 1.5 Points) per each dollar in Net Purchases. • Fractions of Points greater than .50. are rounded up and less than or equal. to .50 are rounded down. • There’s no limit to how many Points you. can earn.