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total invitee=90
people who attended=2/3 of 90 = 60
people who gave cash= 60-(1/10)*60-1/5(60)
=>42
total cash= 175*42
7350 (option B)
Bunuel
Mr. and Mrs. Walters invited 90 people to their wedding. One-tenth of the attendees brought appliances as gifts, twenty percent of the attendees gave gift certificates as gifts, and the rest of the attendees gave cash. If only two-thirds of the invited guests attended, there were no uninvited guest and the average (arithmetic mean) cash gift was 175 dollars, how much cash did Mr. & Mrs. Walters receive?

A. $3,150
B. $7,350
C. $8,400
D. $9,450
E. $11,025


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