Answer:
2 toppings.
Explanation:
All you do is add each topping cost to the large pizza cost. So add 6.80 and 0.90. And then add 7.30 and 0.65. Keep adding toppings until both of the costs are equal.
6.80+0.90= 7.70 7.30+0.65= 7.95
7.70+0.90=8.60 7.95+0.65=8.60
You added it twice so two toppings.