Rule 42 of GST ITC Reversal

Hi,

In Rule 42 of GST 

D2=The amount of credit attributable to non-business purposes if common inputs and input services are used partly for business and partly for non-business purposes and shall be equal to 5% of C2 and calculated as

D2=C2×5%

In our case we dont have any non business purpose activities. So i need to calculated the 5% of C2 or the 5% reversal not applicable to me

Please clarify