Sixth Grade Challenging Math

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6-74)   Answer

                       44%

Solution:

Final bed size is 4* (1+20%) * 6* (1+20%) =34.56

Increased by 34.56 - 4*6 = 10.56; 10.56/24=44%

Simpler solution: Assume original bed size is 1, the final size is (1+20%) * (1 + 20%) = 1.44.  Therefore, the bed size increased by 44%.