Help please.

Iam trying to calculate the gain of the infirmary.

And sportshop and want to be able to reverse the equation.

Player had 4 energy percent recovery per hour(max).

1.At infirmary level 14 with 55% gain his recovery rate is stated 8.89/h.

1. 8.89-55%=4

How do I calculate this in reverse 4 + 55% = 6.2

And once sport shop items is bought how will that enter equation?

Any help appreciated

Iam trying to calculate the gain of the infirmary.

And sportshop and want to be able to reverse the equation.

Player had 4 energy percent recovery per hour(max).

1.At infirmary level 14 with 55% gain his recovery rate is stated 8.89/h.

1. 8.89-55%=4

How do I calculate this in reverse 4 + 55% = 6.2

And once sport shop items is bought how will that enter equation?

Any help appreciated