Fruits and the lucky contest

There are four closed boxes kept for a lucky contest.
There are 4 fruits an apple, a banana, an orange, and a pear) that have been  placed in these four closed boxes.
Contestants will have to guess which fruit is  in which box.

There were 123 contestants.
When the boxes are opened,  it turns out that:
1. 43 people have guessed none of the fruits correctly
2. 39 people  have guessed one fruit correctly
3. 31 people have guessed two fruits  correctly.

How many people have guessed three fruits correctly?
How many people have guessed four fruits correctly?

Click here to find the solution