Energy may be defined as the quantitative property that provides the capacity to do any work. Energy can be present in the different forms. The S.I. unit of the energy is joules.
Energy follows the law of conservation. According to this law, the energy can neither be created and it cannot be destroyed. The energy changes from one form to the another form.
But this rule rule is applicable only for double stranded DNA molecule. The possibility of Adenine=40% and Thymine=60% is only in single stranded DNA molecule. In the question, the DNA sample referred is a single stranded DNA. hope it helps :D
