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Jack has a budget of $100 and he can spend it on goods A and B. His utility is U = 4QA + 5QB. The

Jack has a budget of $100 and he can spend it on goods A and B. His utility is U = 4QA + 5QB. The prices are PA = 5 and PB = 10. If Jack seeks to maximise his surplus, what is the optimal QA?

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