Answer:
3.25
yeah it's confusing but yeah
1. Start with the previous balance: $690
2. Add purchases: $690 + $578 = $1,268
3. Subtract returns: $1,268 - $1,033 = $235
4. Subtract last payment: $235 - $50 = $185
5. Calculate the monthly interest rate: 21% / 12 = 1.75%
6. Multiply the balance by the monthly interest rate: $185 x 1.75% = $3.24
7. Round the finance charge to the nearest cent: $3.24 ≈ $3.25
So, the finance charge using the unpaid balance method is $3.25.