Instructions

What should come in place of question mark (?) in the following number series ?

Question 103

400, 240, 144, 86.4, 51.84, 31.104, ?

Solution

Each number is 60 % of the previous number ,i.e. 0.6 is multiplied to each number.

400 $$\times 0.6$$ = 240

240 $$\times 0.6$$ = 144

144 $$\times 0.6$$ = 86.4

86.4 $$\times 0.6$$ = 51.84

51.84 $$\times 0.6$$ = 31.104

31.104 $$\times 0.6$$ = 18.6624


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