Multiply number by percentage

Hello everyone,

I have a quick question about multiplying a number by percentage knowing that the source number is only 33% of the real number.

For example:

11 is the source (which is only 33% of the real number) I want to increase this by 10% which should be 43% of the real number. I have tried the following but it only increase the usual number 11 by 10%.

=11*(1+0.1)

Example given above is only a short example of the initial formula which is a bit complicated as I have a RAWData of inbound calls (which is only 33% of the initial data) from where I use countifs to get hourly incoming.

I hope its clear to everyone.

Thanks,
Chris