A store offers a $10%$10% discount to customers paying by cash. If Luke purchases goods to the value of $480 with cash, calculate (to the nearest cent):
Christa buys a circular saw selling for $150 at a hardware store.
Through using a credit card, Mae incurs an interest charge of $11%$11% per month on the amount owing during each month. If she owed $220, $980, $270 and $360 during the last four months respectively, what was the total amount of interest she accrued over this period to the nearest cent?
Valentina bought a dining table selling for $6100 at a discount of $13%$13% and on terms of $2379 deposit and 23 monthly payments of $150. Calculate: