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If all 20 pizza are delivered in time, Jane would collect $20 * 15 = $300. 

For each pizza that Jane delivered late, Jane’s will earn $15 + $4 = $19.

$15 being the income for Jane to deliver in time and $4 the penalty charge.

If Jane delivered u pizzas late,

300 – 19u = 205

19u = 95

u = 5

So 5 pizzas were delivered late.

Check: 15 * 15 + (-4)5 = 225 – 20 = 195 Checked.

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