Take me to the text Kayla Tyler sells gifts certificates for $54 each. She purchases each gift certificate for $18 and spends $4,500 for fixed costs. Do not enter dollar signs or commas in the input boxes. Round your answers to the nearest whole number. a) Calculate operating income if Kayla sells 500 gift certificates Operating Profit: $ b) Calculate the revenues needed to obtain an operating income of $2,900. Required Revenue: $