Please help me answer these and perform hypothesis testing for the mean with complete solution

2) According to last year's report, a Filipino household spends an average of P400.00 per day for food. Suppose you recently took random samples of 25 households. You determined how much each household spent for food each day and the results revealed a mean of P390.00 and a standard deviation of P21.50. Using a 0.01 level of significance, can it be concluded that the average amount spent per day for food of a Filipino household has decreased? Assume normality over the population