Ivanhoe Company purchased 16 calculators for $30 each, one-half on May 14 , and the other half on May 22 , all on account. Ivanhoe sold 14 of the calculators on May 25 for $40 each. It received payment for 6 of them on May 30 and payment for the other 8 on June 4 Ivanhoe paid the supplier for 5 of the calculators on May 21 . How much revenue should livanhoe recognize during May? $240 $560 $224 $280