To solve this problem, all we have to do is to closely analyze the situation. Now we are given that the amount of saving per week is equivalent to one fifth (1 / 5) of Ben’s weekly pay (or weekly salary).
Now we are to find the weekly pay or weekly salary that result in weekly savings of $61.50. So we can see that actually the value of 61.50 is one fifth (1 / 5) of W, therefore:
(1/ 5) W = 61.50
W = 5 * 61.50
W = $307.5
Therefore a weekly pay of $307.5 will result in a weekly savings of $61.50