Answer:
11.7
Step-by-step explanation:
Step 1: Our output value 39.
Step 2: We represent the unknown value with x.
Step 3: From step 1 above, 39 = 100%.
Step 4: Similarly, x = 30%.
Step 5: This results in a pair of simple equations:
39 = 100%(1)
x = 30%(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 (%); we have
39/x = 100%/30%
Step 7: Again, the reciprocal of both sides gives
x/39 = 30/100
------> x = 11.7
Therefore, 30% of 39 is 11.7
