To be honest, tell your teacher it's all crap - it's impossible under current conditions to ensure you maintain the balance as equities and their dividends are all shot to pieces, and there's an asset bubble building up in the bonds market.
That means it's impossible to make a value judgement on income and growth at present because of the financial crisis.
And if your teacher says "oh, ho, smarty pants, but I'm talking about under normal conditions" you can tell him that normal conditions no longer exist and will not exist because the entire underlying principles of capitalise markets are being profoundly rewritten by the existing crisis, and therefore it would be impossible and even detrimental to presume past conditions are in any way or form going to be an indicator of future economy performance and principles.
From a more personal point of view as an investor - it is *so* easy to start breaking down investment into equities according to cap, etc, but in practice, it's all completely bollocks. All you do is create pretty patterns, but none of it reflects realities.
For starters, you must understand something of the stocks you are looking to invest in, and sometimes there just isn't the opportunit to spread as wide a risk as you may wish on paper - because at the end of the day, it's all about opportunity, and conditions change quickly. For example, 6 months ago RBS was a large cap equity, but now it's a penny stock. What would an initial paper strategy regard it is?
It's all about risk, and managing risk, and this is so condition-centred it's unbelievable. For example, I'm currently invested in US and UK financials (5:1 ratio), because I think the US financials have been over devalued. I mean, Bank of America at $3.50 a share? Ridiculous! And yet - the banking systems of both the US and UK are effectively bankrupt, so I'm simply riding a bear market rally, and then cashing out.
I wouldn't touch bonds, though.
I read alot about the financials - I feel I have an understanding - and despite this massive financial crisis my entire losses since July 2008 are 1%. Beats the crap out of most funds.
And yet the dangers so ingrained in the current crisis means no investment strategy is safe - manage your risks, and don't over stretch. Nothing else matters.
And tell your teacher this if you will.