Armor DR

local function ArmorDR(A,D)

    return A / (A + (10 * D));
end

return function(msg,usr,chan)

    local parameters = {};
    for number in string.gmatch(msg,"%S+") do
        table.insert(parameters,number);
    end

    local armor = tonumber(parameters [1]);
    local hit = tonumber(parameters [2]);

    if armor==nil or hit==nil then

        print("@"..usr.." enter armor and raw phys hit");
        return;
    end

    print("@"..usr.." taking a "..tostring(hit).." phys hit with "..tostring(armor).." armor would reduce the hit by "..tostring(ArmorDR(armor, hit)*100).."%");
end