Enter a 3-D formula in cell C3 on the October worksheet that calculates the overall percentage of total Sunday Orchestra Frot tickets sold based on the total available Orchestra Front seating. The 3-D formula must perform several internal calculations, avoid raw numbers, and use an appropriate mix of relative and mixed references to derive the correct percentage. Format the result with Percent Style. The result is 100%, based on the sum of the Sunday Orchestra Front tickets sold divided by the total available tickets for all four weeks.