Algebra-1

1. Use the formula for exponential decay:

The formula for calculating the value of a quantity after  time periods with a decay rate  (expressed as a decimal) starting from an initial value  is .

In this case:

The initial weight  of the person is  kg.

The decay rate  is , which in decimal form is .

The number of months  is .

2. Substitute the values into the formula:

Now calculate :

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