Question

The tax rate is 3.9% what is the tax on 42

Answer 1

If the amount is 42 & there is a tax of 3.9% to  be paid,

then the tax will be = amount of invoice x tax in %==> Tax = 42 x 3.9%=1.64

Answer 2

42 x .039=$1.64 your welcome I hope this helped you