If half of the umbrellas not sold in city A, then find the difference between the numbers of umbrellas sold in city A and city E.
Number of umbrellas sold in city A = 1/2 × 4200 × (10/100) = 210 Number of umbrellas sold in city E = 4200 × (14/100) = 588 Required difference = 588 – 210 = 378
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The average age of a group of 20 persons is found to be 27 years. Later it is found that age of two of the persons is calculated as 25 and 30 instead of...
