How to get the number Needed Survey

[abakadang]

Need help, i need to know on how many survey I needed to achieve my goal

here is the sample

Count of score	Bad	Good	Grand Total	Survey %	Target %	Needed Survey
Human	4	13	17	76.47%​	90%	?

 

[Joe4]

Welcome to the Board!

I am not quite clear exactly what you are trying to do (are you looking for the total number of surverys depending on how many bad ones you have so far, or just how many more you need?).
Using the example you posted, please walk us through the logic showing us how to arrive at the value you want.

 

[abakadang]

I want to see the needed number of surveys depends on how many bad surveys I have. Apologize for confusions

 

[Joe4]

If number of Bad Surveys is in cell B2 and the percentage you need is in cell F2, then use this formula:

=B2/(1-F2)

which will return 40 in your example.