Pertanyaan

D ik e t ah u i f u n g s i p er min t aan P d = 100 − 2 1 Q . J ika j u m l ah y an g d imin t a b er u bah d a r i 20 m e nja d i 30 , maka b es a r k oe f i s u i e n e l a s t i s i t a s n y a a d a l ah ...

$D ik e t ah u i f u n g s i p er min t aan P_{d} = 100 - \frac{1}{2} Q . J ika j u m l ah y an g d imin t a b er u bah d a r i 20 m e nja d i 30, maka b es a r k oe f i s u i e n e l a s t i s i t a s n y a a d a l ah ...$

L. Avicenna

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

Jawaban terverifikasi

Pembahasan

$D i k colon space P subscript d space equals space 100 space – space 1 half Q space space space space space space space space space Q subscript d 1 space equals space 20 space space space space space space space space space Q subscript d 2 equals space 30 space D i t colon space K o e f i s i e n space E l a s t i s i t a s space P e r m i n t a a n ? space J a w a b colon space space M e n g g u n a k a n space r u m u s colon E equals fraction numerator b space x space P over denominator Q end fraction K e t e r a n g a n colon space E space equals space K o e f i s i e n space e l a s t i s i t a s space b space equals space p e n a m b a h a n space m a r g i n a l space P space equals space H a r g a space Q space equals space J u m l a h space b a r a n g P e r t a m a space f u n g s i space p e r m i n t a a n n y a space d i u b a h space d a r i space p o s i s i space P d space m e n j a d i space Q d space P d space equals space 100 space – space 1 half Q space space Q subscript d space equals space 100 space – space P d space space Q subscript d space equals fraction numerator 100 minus P d over denominator begin display style 1 half end style end fraction Q d space equals space 200 space – space 2 space P space space L a l u space m e n c a r i space P comma space left parenthesis s u b s t i t u s i space Q d 1 right parenthesis space P space equals space 100 space – space 1 half space left parenthesis 20 right parenthesis space P space equals space 100 space – space 10 space P space equals space 90 space S e t e l a h space i t u space d i c a r i space k o e f i s i e n space e l a s t i s i t a s space p e r m i n t a a n n y a colon space space b space equals space minus space 2 space Q subscript d 1 end subscript space equals space 20 space P space equals space 90 space space E space equals fraction numerator negative 2 space x space space 90 over denominator 20 end fraction space equals space minus space 9 space space E space equals space 9 comma space k a r e n a space s i f a t space k o e f i s i e n space e l a s t i s i t a s space s e l a l u space m e n g g u n a k a n space b i l a n g a n space p o s i t i f.$