Verified Answer :

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x - the amount

\(x-60\%x=x-0.6x=0.4x\)

To decrease an amount by 60%, you can multiply it by 0.4.

Answer: 0.4 is the single multiplier.

Explanation:

Since, If a amount is decreased by 60 % then remaining amount is (100-60)%=40% of the initial amount.

And, 40%= 40/100=0.4

Thus, when we decrease an amount by 60%,

then the resultant amount = 40% of the initial amount= 0.4 times of the initial amount.

Therefore after multiplying by 0.4 we can decrease an amount by 60%.

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