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a certain sum doubles in 12yrs if invested in simple interes.what is the rate of interest

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cost price of 21 apples is equal to selling price of 18 apples.what is the profit %? A sequence x1 , x2 and x3 … is said to be in a harmonic progression if the reciprocals 1/x1,1/x2
and 1/x3 are in arithmetic progression. The 5th term and the 7th term for an harmonic progression are 30
and 50 respectively. What is the difference between the 6th and 4th term.
a. 16 b. 14.5 c. 13.4 d. 12.5.