''Anybody with enough mathematical ability to make it to year 7 would have no trouble working it out.''
I put some solar panels on my roof and organised myself a bit more efficiently. My bill went from about $680 to $190 per 2 months average. Cost sub $5K, 3.5 years ago. Could you work it out for me, I don't have the ''mathematical ability''. Was I stupid to do so?
