When you only know the result of applying a percentage to an initial but do not know the initial amount, then it is a problem where the percentage associated with the 100 number is not explicit. For example: If 870 is 60% of an amount x, then the product of 60% by x is equal to 870: 0.60 \, x \, = \, 870 Then, by solving the above equation, we find the initial amount associated with 100%: \ frac {0.60 \, x} {0.60} \, = \, \ frac {870} {0.60} x \, = \, 1450 Therefore, 870 is 60% of ______________ (response)
