For the decimal expansion of a rational number $\frac{p}{q}$ to be terminating,if $q = 2^m \cdot 5^n$,then $m, n \in$ . . . . . . ($R$,$N \cup \{0\}$,$Z$)
- A$R$
- B$N \cup \{0\}$
- C$Z$
- D$N$
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In the decimal representation of $\frac{7}{80}$,how many digits will be there after the decimal point?
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| $C. 51$ | |
| $D. 50$ |
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