Determine the interest on the following notes: (Round answers to 2 decimal places, e.g. 52.75. Use 360 days for calculation.) (a) $1,960 at 6% for 90 days. $ (b) $1,080 at 9% for 5 months. $ (c) $2,940 at 8% for 60 days. $ (d) $1,650 at 7% for 6 months. $