A department store buys 400 shirts at a cost of $10,800 and sells them at a selling price of $30 each. Find the percent markup. Pls hurry

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?