Answer: 
Step-by-step explanation:
Given
Raju buy an old car for 
He spent
on its repair
The selling price of the car 
So, the cost price is

Here, 
Gain percent is

Answer:

Step-by-step explanation:
The solution is in the picture
At line 7, the denominator of the expression contains irrational number (which is surd 10). This shows that the expression is not simplified
At line 8 of my solution, multiply both numerator and denominator by the conjugate of

which is

in order to eliminate irrational number at denominator
More info of conjugate
The conjugate of a+b is a-b,
Why conjugate? Try it yourself!
Hint: (a+b)(a-b) = a^2 - b^2
Subtract 59 from both sides, you get x=-179
Grouping similar factors together makes this easier:
(8)(2)(10^7)(10^6) = 16(10^13) = 1.6(10^14)