A store bought 200 toys at a cost of ​$20 each. The store sold all the toys at a percent markup of 35%. Find the total selling price.

The markup percentage is 35%, which can be written as 0.35 in decimal form.

The selling price of each toy is the cost price plus the markup. Therefore, the selling price of each toy is:
$20 + ($20 * 0.35) = $20 + $7 = $<<20+20*0.35=27>>27

The total selling price is the selling price per toy multiplied by the number of toys:
$27 * 200 = $<<27*200=5400>>5400

Therefore, the total selling price is $5400. Answer: \boxed{5400}.