the conditions, means, needs and other circumstances of each spouse and the child for who the support is ought. ??? There seems to be a variety of method used to calculation how the 40% is arrived at. ??? <a href="http://stanleypotter.com/faq-support-payments.htm#reducedchildsupport">http://stanleypotter.com/faq-support-payments.htm#reducedchildsupport</a> 3.