Question

There are about 100 million smartphones in the US. Ms. Maria has one smartphone. What share of US smartphones does Ms. Maria have? Express your answer using a negative power of 10.

• A. ${10}^{-6}$
• B. ${10}^{-7}$
• C. ${10}^{-8}$
• D. ${10}^{-9}$

Answer 1

The correct option is C ${10}^{-8}$

Number of smartphones = $100$ million $=100\times {10}^6={10}^8$
Share of smartphones that Ms. Maria has $=1/{10}^8={10}^{-8}$