You buy a watch that costs 45.50 the tax on the watch is 6% what is the final cost

The final cost is $48.23

To find that you had to change the 6% to a decimal, which will be 0.06. Then you'd multiply 0.06 with 45.50 which will give you 2.73

Finally you'll add $2.73 with 45.50 to get $48.23