Unpaid balance is : $149.99-$50 = $99.99 New balance = 149.99+2.62-50 = $102.61 Finance charge = 99.99- 0.21/12= $1.75 New balance = 99.99+1.75 = $101.74 Average daily balance method Average daily balance= 3399.70/30 = $113.32 Finance charge = $ 0.21/12Ă—113.32 = $1.98 New balance = $149.99-50+1.98 = $101.97