The Half-Life of ³⁰P Is 2 $\times$ 10¹⁰ Nuclei Present Initially,after 10

The half-life of ³⁰P is 2.50 minutes.If a sample of ³⁰P has 1.60 $\times$ 10¹⁰ nuclei present initially,after 10.0 minutes how many remain?

A) 0.800 $\times$ 10¹⁰
B) 0.400 $\times$ 10¹⁰
C) 0.200 $\times$ 10¹⁰
D) 0.100 $\times$ 10¹⁰
E) 0.050 $\times$ 10¹⁰