exam Maths Puzzle Numerical Ability

[1/(a5b)]-[5/(ab3)]

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A homeowner wishes to insulate her attic with fiber glass insulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafters in the att an investment of 10,000 in 1997 grew to 14,309.61 in 2002 use this formula r=(s/p)^1/n-1
p=initial investment
s=amount its worth after n years
find the 5 year average annual ret