Final answer:
The store's profit on the video game Elsie bought for $85.00, when sold at 170% of its cost, is $59.50.
Step-by-step explanation:
Elsie bought a video game for $85.00, and the store charges 170% of its cost for the game. To find the store's profit, we calculate the selling price first by multiplying the cost by 170%, then subtracting the original cost from the selling price. Since 170% as a decimal is 1.70, we calculate $85.00 × 1.70 = $144.50 as the selling price. The store's profit is the selling price minus the cost, which is $144.50 - $85.00 = $59.50.