After T Years, the Remaining Mass Y (In Grams)of 24 $y = 24 \left( \frac { 1 } { 2 } \right) ^ { t / 30 } , t \geq 0$

Multiple Choice

After t years, the remaining mass y (in grams) of 24 grams of a radioactive elements whose half-life is 30 years is given by $y = 24 \left( \frac { 1 } { 2 } \right) ^ { t / 30 } , t \geq 0$ . How much of the initial mass remains after 50 years? Round your answers to two decimal places.

A) 7.56 grams
B) 14.40 grams
C) 3.17 grams
D) 16.44 grams
E) nothing remains