In march, Jaka received a voucher worth Rp500,000 which could be used to buy grilled chicken or grilled fish at the campus cafeteria. The voucher could not be used to purchase other dishes. Any remaining amount in the voucher could not be used beyond February. That month, the price of grilled chicken was Rp25,000 per portion and grilled fish was Rp20,000 per portion. Jaka purchased 12 portions of grilled chicken and 10 portions of grilled fish. Jaka received a similar voucher this month, but the price of grilled fish has increased to Rp25,000 per portion. Jaka decides to buy 15 portions of grilled chicken and 5 portions of grilled fish. i. Illustrate graphically Jaka's purchases last month and this month, clearly showing the substitution effect, income effect, and total effect on the graph.