A store bought 400 toys at a cost of $20 each. The store sold all the toys at a percent markup of 20%. Find the total selling price.
The markup on each toy is 20% of $20, which is 0.2*20 = $<<20*0.2=4>>4.
The selling price of each toy is $20+$4 = $<<20+4=24>>24.
The total selling price for all the toys is $24 * 400 = $<<24*400=9600>>9600. Answer: \boxed{9600}.