Question 315259
{{{2^3/2^7=2^(3-7)=2^(-4)=1/(2^4)=1/16}}} <--- CORRECT!
In decimal form,
{{{1/16=0.0625}}} <--- CORRECT!
Now switching from decimal to scientific, you lost something.
To go from decimal to scientific, move the decimal point over two places, and add an exponent of 2 (from the 2 place move).
{{{0.0625=6.25x10^(2)}}}
The last one you need is percent. 
Percent means out of 100.
{{{0.0625=X/100}}}
Solve for X and then your answer is X%.