Amelia receives her monthly Telstra mobile phone bill on $27$ June $2023.$ Assume that Amelia uses the phone $75$ per cent for business purposes. The amount of $$100$ is due for payment on $27$ July $2023.$ Amelia pays her phone bill on $14$ July $2023.$ Required On what date has Amelia incurred the phone expense? Explain why its $27$th June $2023$