Cost of house : R285 000 Replacement value R325 000 Expected life ; 20 years.
The house is 3 years and 6 months old, determine its current value including inflation.​

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source: