Armor Required

local function Required(DR,D)

    return (DR * 10 * D) / (1 - DR);
end

return function(msg,usr,chan)

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

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

    if dr==nil or hit == nil then

        print("@"..usr.." enter decimal reduction and raw phys");
        return;
    end

    print("@"..usr.." to reduce a "..tostring(hit).." phys hit by "..tostring(dr*100).."% you need "..tostring(Required(dr,hit)).." armor");
end