The net price of an item after trade discounts of $34\mathrm{.}00\%,13\mathrm{.}00\%,$ and $3\mathrm{.}50\%$ is $$3,520\mathrm{.}00.$

a$.$ Calculate the regular selling price of the goods.

$$0\mathrm{.}00$

Round to the nearest cent

b$.$ Calculate the equivalent discount rate of the series of discount rates.

$0\mathrm{.}00$

$\%$

Round to two decimal places