Current Attempt in Progress Determine the interest on the following notes: (Round intermediate calculations and answers to 2 decimal places, eg. 52.75) (a) $2.000 at 6% for 90 days. $ (b) $900 at 9% for 5 months. $ (c) $3,000 at 8% for 60 days $ (d) $1,600 at 7% for 6 months $