The expression in fraction form will be:

The denominator can be multiplied to the numerator by taking its reciprocal as shown below:

There are no common factors, so the expression can not be simplified any further.
The correct anwer is -21 and how i got that is by taking -7*300 to get -21 as my answer let me know if it helped any...
Answer:
From the chapter Playing with numbers
we can define derek has 2×10^2 + 7 × 10^1 + 7× +0^0
as If ABC a number then ABC can be written as 10^2A+10^1B+10^0C
Hope it helps