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djfroofy/amortize.lua

Created May 28, 2012 16:22
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LUA Mortgage payment calculator
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amortize.lua
#!/usr/bin/env lua
function monthly_payment(principal, apr, years)
local i = apr / 12
local n = years * 12
return principal * (i + (i / ((1 + i)^n - 1)))
end
local principal = tonumber(arg[1])
local apr = tonumber(arg[2]) / 100
local years = tonumber(arg[3])
print(string.format("%2.2f", monthly_payment(principal, apr, years)))
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