* Maria served for 7 years
* She has a monthly salary of P13,000
* Retirement pay is at least half a month's salary for every year of service
* Half a month's salary is 13,000 / 2 = P6,500
* She served for 7 years
* So her retirement pay is 6,500 x 7 = P45,500
Therefore, the retirement pay for Maria Patria Adorada de la Guardia el Estrikta is P45,500.