Answer:
overspent $341.25.
Explanation:
If the tables bought were 25 at a price of $1706.25 with tax of 5%. Therefore we can work out how much was paid for per table:

The company paid $68.25 per table. They only need 20 tables and should of paid:

Therefore the company should have paid $1365 instead of $1706.25, so they overspent $341.25.