rate of $4\mathrm{.}00\%$ per annum instead of $3\mathrm{.}50\%$ per annum? Round to the nearest cent.

a$.$ $$12\mathrm{.}89$

b$.$ $$10\mathrm{.}63$

c$.$ $$5\mathrm{.}96h$

d$.$ $$11\mathrm{.}78$