Final Answer:
Calvin had $200 at the end of June, considering he had $100 more than at the end of February.
Explanation:
To determine Calvin's financial status at the end of June, it's crucial to analyze the given information. Given that Calvin had $100 more at the end of June than at the end of February, this implies a specific increase in his savings over the period between February and June. Mathematically represented as J - F = $100, where J denotes Calvin's savings at the end of June and F represents his savings at the end of February, this equation demonstrates the $100 increase in savings during this period.
Assuming Calvin's savings at the end of February were denoted as F, and considering he had $100 more by the end of June, the equation for June's savings can be written as J = F + $100. Substituting the value of F, Calvin's savings at the end of February, into this equation, J = F + $100 becomes J = $F + $100. Given that the increase was precisely $100, Calvin's savings at the end of June amounted to $100 more than his savings at the end of February. Hence, Calvin had $200 at the end of June, derived from the equation J = $F + $100.
Therefore, based on the given information that Calvin had $100 more at the end of June than at the end of February, the precise amount he had at the end of June would be $200, considering the $100 increment in his savings over the mentioned period.