A new kind of filament lamp has been created by researchers and it has an efficiency of $40\%$. The efficiency of older filament lamps is $5.0\%$. Both lamp types give the same useful output power. What is the ratio $\dfrac{\text{input power to new type of lamp}}{\text{input power to old type of lamp}}$?
- A0.13
- B0.63
- C1.6
- D8.0