Accountants can't count (take 2)

A convention to prove that accountants can count is set up in a massive stadium.

Accountants from all over the world watch as the MC calls up the first volunteer and asks him, ‘What is 15 plus 15?’

After 20 seconds the volunteer says, ‘Eighteen'

Everyone is a little disappointed and the accountants all round the stadium start yelling. ‘Give him another chance! Give him another chance!’

The MC says, ‘Well I guess we can give him another chance. What is five plus five?’

After 30 seconds the volunteer says, ‘Ninety?’ Everyone is crestfallen but the accountants again start yelling, ‘Give him another chance! Give him another chance!’

The MC says, ‘Okay! One last chance. What is two plus two?’

The accountant closes his eyes and after a whole minute eventually says ‘Four.’

The accountants start yelling. ‘Give him another chance! Give him another chance!’