The answer is 140%.
The simplest way to solve without a calculator is to turn the mixed number into a fraction. To do this, multiply the whole number by the denominator, then add that number to the numerator. From here, you can multiply the numerator and the denominator so that the denominator is equal to 100.
1 2/5
5(1) = 5
5 + 2 = 7
7/5
7(20) / 5(20)
140 / 100
140%
Hope this helps! :)