14. Gina earns \( \$ 300.00 \) per week plus a \( 5 \% \) commission rate in all her sales. If Gina sold \( \$ 4,200.00 \) worth of merchandise last week, how much will Gina's total earnings will be from last week?
a) \( \$ 410.00 \)
b) \( \$ 510.00 \)
c) \( \$ 610.00 \)
d) \( \$ 710.00\)
B
Find the solution of the exponential equation \( 16 e ^ { x } = 12 \) in terms of logarithms, or correct to four decimal places. \( x = \)
Certain radioactive material decays in such a way that the mass remaining after \( t \) years is given by the function
\( m ( t ) = 100 e ^ { - 0.01 t } \)
where \( m ( t ) \) is measured in grams. (a) Find the mass at time \( t = 0 \) . Your answer is (b) How much of the mass remains after \( 20 \) years? Your answer is Round answers to \( 1 \) decimal place.
