We are told that $168.00 represents 8% of the contract price; therefore,we know that 
original price *( 8/100) = $168.00
Now, writing out "original price" is a bit space-consuming; therefore, we will just rename it and say 
original price = OP
Then, our equation above can be written as 

We solve for OP (original price) by multiplying both sides by 100 and then dividing by 8. This gives us 


Hence, the original contract price is $2100.