Write these as normal numbers.
a)
6 x 108
b)
3 x 10°
c)
9 10
d) 2 x 100

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax