Gayle's Glassworks makes glass flanges for scientific use. Materials cost \$1 per flange, and the glass blowers are paid a wage rate of \$28 per hour. A glass blower blows 10 flanges per hour. Fixed manufacturing costs for flanges are $28,000 per period. Operating costs associated with flanges are S10,000 per period and are fixed. Assume Gayle's Glassworks manufactures and sells 10,000 flanges for $10 each. Due to a downtum, she is expecting to sell only 5,000 flanges this perind. What will be the best estimate of Gayle's operating income? $24,000 $(7,000) $31,000. $(7,500)