Answer:
50
Explanation:
cost is $50
she charges $1
she will make $50 for selling 50
she will make a profit of $1 on the 51 st glass
Profit function:
```
p(g) = revenue - cost = 1g - 50
```
Number of glasses to break even:
```
p(g) = 0
```
```
1g - 50 = 0
```
```
g = 50
```
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