WILL GIVE BRAINLIEST! Use the markup equation S = C + rC, where S is the selling price, C is the cost, and r is the markup rate.

A car navigation system costing $370 is sold for $447. Find the markup rate. Round to the nearest tenth of a percent.
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David and alton are training for a race. they spend 35 minutes stretching and then go on a 5 mile practice run. david runs at a pace of 7 min/mile. alton runs at a pace of 8 min/mile. write an equation for each runner that shows the total length of their workout. then solve each equation showing your work