A large language model is designed to improve its arithmetic accuracy by using an external calculator. The calculator is activated when the model generates text enclosed in ≪ ... ≫ symbols. Within these symbols, an equals sign (=) must be present to signal the tool to evaluate the expression that comes before it.

Your task is to solve the following problem as if you were the language model. Write the exact string the model should generate to calculate the total cost of 5 apples that cost $0.75 each. Your response should show only the calculation step that would be sent to the external tool.