A color photograph taken with a $2.5$ mega pixel camera is converted into digital format using $4\cdot10^0$ bytes per pixel. Photographs taken with a $2.5$ mega pixel camera each have $2.5\cdot10^6$ pixels.
**How many of these photographs can be stored on a $200 \text{ GB}$ hard disk?**
Write your answer in scientific notation.
For reference:
$1\text{GB}=1\cdot10^{9} \text{ bytes}$
[[☃ expression 1]]