Answer: -$843
Explanation:
843 x 3 = $2529
843 x 2 = $1686
2529 - 1686 = $843
The zoo makes $2529 on a regular night, but because there is a discount, they make $1686. The amount of money is the difference between the two totals. Therefore, the total amount of money the zoo lost by reducing the price is $843.