Step 1: Our output value is 280.
Step 2: We represent the unknown value with x
Step 3: From step 1 above,280 = 100 percent
Step 4: Similarly, x = 40 percent
Step 5: This results in a pair of simple equations:
280 = 100 percent (1)
x = 40 percent (2)
Step 6: By dividing equation 1 by equation 2 and noting that both the RHS (right hand side) of both
equations have the same unit (percent); we have
280/x = 100percent/40percent
Step 7: Again, the reciprocal of both sides gives
x/280 = 40/100
>x = 112
Therefore, 40percent of 280 is 112