Math Formula dont get it!!

Iv'e got a problen, with that formula I tried 0.40*100 and 0.60*100 but when i had in one group 1 person he will need to pay it all and its not correct.. Read in the picture.
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Attach a sample workbook (not image).

Make sure there is just enough data to demonstrate your need. Include a BEFORE sheet and an AFTER sheet in the workbook if needed to show the process you're trying to complete or automate.

Make sure your desired results are shown, mock them up manually if necessary.

Remember to desensitize the data.

Click on GO ADVANCED and then scroll down to Manage Attachments to open the upload window.

I would use Goal Seek here.

Let's say that your data is in B3:F4

Create another column for HAVE (in A3) using this formula:
A4 =C4*E4+D4*F4

Now, put this formula in D4:
=C4*1.5

Now you can go to Data > What-If Analysis > Goal Seek
Set cell: A4
To value: 100
By changing cell: C4

You will see that C4 has changed to $9.09