Money that grows

Money that grows · Jardim de Bispera

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title "Compound interest"
input start = 1000 "Starting amount"
control rate = 6 0..15 step 0.5 "Yearly rate (%)"
control years = 10 1..40 "Years"
value total = start * (1 + rate / 100) ^ years
value gain = total - start
text "After {years} years, {start} becomes {total:2}."
text "The interest alone is now bigger than what you put in." when gain > start
plot total over years "Total"
check "How much do you gain in {years} years at {rate}%?" = gain
reveal "See the formula" "total = start × (1 + rate)^years"

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