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la] Explain how the following factors affect the marginal cost and benet of an extra level of education: ii] earning after taking this extra level of education (ii:- earnings you have if you do not take this level of schooling and start working {iii} monetary cost of the education {iv} difficultyr of the education {it} the market interest rate one can borrow and lend money:r {vi} degree of time preference [whether you discount future consumption a lot} lb] According to part la}, is Bill Gates\" choice of quitting university a rational choice? [c] According to part [a}, why do more able workers generally choose to have more education? Id] 'I.|"i|'h-,.r is there an upward bias if we take the observed wage difference between people with different level of education as the causal effect of education