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diff --git a/challenge-090/paulo-custodio/lua/ch-2.lua b/challenge-090/paulo-custodio/lua/ch-2.lua
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+#!/usr/bin/env lua
+
+--[[
+Challenge 090
+
+TASK #2 > Ethiopian Multiplication
+Submitted by: Mohammad S Anwar
+You are given two positive numbers $a and $b.
+
+Write a script to demonstrate Ethiopian Multiplication using the given numbers.
+--]]
+
+function mul(a, b)
+    local m = 0
+    while (true) do
+        if ((a & 1) ~= 0) then
+            m = m + b
+        end
+        if (a <= 1) then
+            break
+        end
+        a = a >> 1
+        b = b << 1
+    end
+    return m
+end
+
+io.write(mul(tonumber(arg[1]), tonumber(arg[2])), "\n")