How do you calculate gross amount for net amountas i need to find out the net amount?

For example :

if net amount is : $2.520,-- = 100%

SS = 7%

Tax= 18%

Gross amount is :Excel = 2.520.- divided to ( / ) (100%-7%-18%)

=(2.520,--) / ( 100%-7%-18%) or = 2.520/(1 - 0.25) gross is : $ 3.360.--

SS is 3.360,- x 7% = 235.20

Tax is 3.360,-x 18% = 604.80

Net is : $3.360-$235.20-$604.80 = $2520 ( net )

RZ laya