Richardson Ski Racing $($RSR$)$ sells equipment needed for downhill ski racing. One of RSR$$s products is fencing used on downhill courses. The fence product comes in $150-$foot rolls and sells for $$215$ per roll. However, RSR offers quantity discounts. The following table shows the price per roll depending on order size: From $1,71,141,281$; To $70,140,280,$ and up; Price per roll $$215,$ $$195,$ $$175,$ $$155.($a$)$ Use the VLOOKUP function with the preceding pricing table to determine the total revenue from these orders. $($b$)$ Use the COUNTIF function to determine the number of orders in each price bin.