Adding And Subtracting Decimals

Subtract.
 $19.86\ -\ 4.94=\$  

Add.
 $2.850\ +\ 17.975=\$  

Subtract.
 $10.756\ -\ 6.238=\$  

Add.
 $75.6\ +\ 21.3=\$  

Joe's Pizza Shop sells an average of 89.7 pizzas on Tuesday nights and an average of 210.5 pizzas on Saturday nights. How many more pizzas does Joe's Pizza Shop sell on Saturdays?