1.62, 15/20, 16.2% is the answer
The order is .. 84%, 7/8, 43/50, 0.91
The 'template' for a quadratic function is:

, where <em>a</em> is the vertical stretch/compression factor.
If the <em>a</em> in f(x) is 2/5, then vertically stretching the function is done by multiplying the function by 2, making: