Students are raising money for a field trip by selling almond bars and cherry sours. The almond bars cost $0.75 each and will be sold for $2.75, and the cherry sours costs $1.50 per bag and will be sold for $4. The students need to raise at least $300 to cover their trip costs. a) Write an inequality that relates the number of almond bars, a, and the number of bags of cherry sours, c, to the needed income.