$1.$ Look at the Keynesian consumption function: C $=600+(0\mathrm{.}75$ Yd$).$

$($a$)$What part of it relates to autonomous consumption $(0\mathrm{.}75$ point$)?$ What part of it relates to induced consumption $(0\mathrm{.}75$ point$)?$

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$($b$)$ How much is the multiplier $(1$ point$)?$