Frightproof Commuter Airlines is considering adding a new flight to its current schedule from Metro to Hicksville. This route has the following prices and costs. Selling price per passenger per flight Variable cost per passenger per flight Fixed cost per flight Income tax rate $60 30 4,200 30% Required: a-1. Compute Frightproof's break-even point in number of passengers (units) per flight. a-2. Compute Frightproof's break-even point in sales dollars per flight. b-1. How many passengers per flight must Frightproof have to earn $1,680 per flight after taxes? b-1. How much must Frightproof generate in sales revenue to earn $1,680 per flight after taxes? 140 passengers a-1. Break-even point in units: a-2.Break-even point in dollars: b-1. Number of passengers b-2. Sales revenue: per flight per flight