When a number is increased by 21%, the result is 102. What is the original number to the nearest tenth?

84.30

Step-by-step explanation:

Let the number = x

x + 21/100 x = 102 Combine the left hand side.

x + 0.21x = 102 Add the left

x (1 + 0.21) = 102 Combine

1.21x = 102 Divide by 1.21

1.21x/1.21=102/1.21

x = 84.2795 To the nearest 1/10

x = 84.30