I didn’t get the value that I need

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A – Price on app (fieldname12)
B – In store price (the formula is: 100/115 x price on app) (fieldname13)
C – Amount to be paid (fieldname18)
D – Mark up by fixed percent (the formula is: 15% x in store price) (fieldname17)
E – Total from price on app (fieldname19)

I need a calculator that will calculate amount C. I have the A value, and B value is needed for me to get amount C. However, in order to get amount C, the B value will minus by D value. Below is the formula that I did but the value is not as what I expected.

a. fieldname19 = fieldname12
b. fieldname13 = (100/115)*fieldname12
c. fieldname17 = 0.15*fieldname13
d. fieldname18 = fieldname13-fieldname17

Please help me and inform me, if the function that I need is only can be done by premium user only. Thank you.

The page I need help with: [log in to see the link]

 

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