Final answer:
Chris and Sam should aim to save less than $2,500 per year to reach $50,000 by the time their child is 18, taking into account a 7% annual rate of return and maximizing the CESG benefit. Precise calculations would require a financial calculator due to the effects of compounding interest.
Step-by-step explanation:
To calculate how much Chris and Sam need to save each year for their child's post-secondary education to reach $50,000 by the time the child is 18, we use the concept of compound interest and consider the Canada Education Savings Grant (CESG). They are entitled to a 20% government match on contributions of up to $2,500 per child per year, which equates to a maximum CESG of $500 annually per child, until the child turns 18.
Assuming a 7% annual rate of return, we can approximate the required savings. First, we maximize the CESG by contributing $2,500 per year, resulting in $3,000 annually with the grant. However, this alone over 18 years would yield approximately $96,000 (compounded annually), which is higher than the $50,000 goal. To meet exactly $50,000, less than $2,500 can be saved annually, but precise calculations would require a financial calculator or specific software to account for the compounding effect and to solve for the exact annual contribution needed.