$1.$ L$$t$$ay y$$ur $$i$$t$$r ha$$ a r$$b$$t $$ngin$$ring bu$$in$.$ In parti$$ular$,$h$$ll$$ kit$$ t$$ build y$$ur $$wn r$$b$$t$.$in$$ th$$ pand$$mi$$ f$$r$$d many p$$pl$$ t$$tay in$$id$,$ th$$ kit$$ b$$am$$ v$$ry p$$pular am$$ng kid$,$ and adult$$ alik$.$h$$ r$$gniz$$ an $$pp$$rtunity f$$r in$$r$$a$$ing th$$ r$$v$$nu$$ by in$$r$$a$$ing th$$ pri$$ f$$r th$$ kit$.$ Y$$u$,$ having tak$$n th$$ prin$$ipl$$f $$n$$mi$$la$,$ y$$u kn$$w thing$$ might n$$t g$$ a$$ y$$ur $$i$$t$$r ha$$ plann$$d$.$ What w$$uld advi$$ h$$r t$$n$$id$$r b$$f$$r$$ g$$ing thr$$ugh th$$ plan? Pl$$a$$xplain y$$ur an$$w$$r $$ar$$fully $(2$ p$$int$)$

$2.$ Lina i$$ having a gr$$at y$$ar$,$h$$v$$n g$$t a rai$$ at a j$$b$.$h$$ r$$aliz$$ that a$$ h$$r in$$m$$ in$$r$$a$$d by $5\%,$h$$tart$$d buying m$$r$$ by $1\%.$al$$ulat$$ th$$ pr$$p$$r $$la$$ti$$ity f$$r th$$ g$$d and int$$rpr$$t th$$ an$$w$$r $(1$ p$$int$)$