Kā aprēķināt Compound Interest
Kas ir Compound Interest?
Compound interest calculates interest on both the initial principal and the previously accumulated interest. Unlike simple interest (which only grows on the principal), compound interest grows exponentially — your interest earns interest. Einstein reportedly called it "the eighth wonder of the world."
Soli pa solim ceļvedis
- 1Start with your principal amount P
- 2Determine the annual rate r and how often it compounds (n times per year)
- 3Apply the formula: A = P(1 + r/n)^(nt)
- 4The difference A − P is the total interest earned
Worked Examples
Ievade
$1,000 at 5% for 10 years (annual)
Rezultāts
$1,628.89
1000(1.05)¹⁰ — earned $628.89 interest
Ievade
$1,000 at 5% for 10 years (monthly)
Rezultāts
$1,647.01
Monthly compounding earns $18.12 more
Ievade
$5,000 at 7% for 20 years (annual)
Rezultāts
$19,348.42
Nearly 4× the initial investment
Ievade
$100/month for 30 years at 8%
Rezultāts
$149,035.94
Total invested: $36,000. Interest: $113,035
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