Number of Toppings Price at Pete’s Price at Patti’s
0 $4.00 $5.50
1 $5.00 $6.50
2 $6.00 $7.50
3 $7.00 $8.50
At Pete’s Ice Cream Parlor, sundaes are $4.00 plus $1.00 per topping. At Patti’s Ice Cream Parlor, sundaes are $5.50 plus $1.00 per topping. How much will a six-topping sundae cost at Pete’s and at Patti’s?
At Pete’s Ice Cream Parlor, a six-topping sundae would cost $4.00 + ($1.00 * 6) = $10.00.
At Patti’s Ice Cream Parlor, a six-topping sundae would cost $5.50 + ($1.00 * 6) = $11.50. Answer: \boxed{10, 11.50}.