DIKETAHUI :

M = Rp.120.000

Qy = 100 unit

Qx = 75 unit

a. Y = 𝑀

𝑃𝑦 -

𝑃𝑥

𝑃𝑦 x

Y = 120.000

600 -

800

600 x

Y = 200 - 4

3 x

Jika Y = 0 ; X = 150 (150 ; 0)

Jika X = 0 ; Y = 200 (0 ; 200)

𝐸0 = (75 ; 100)

b. ∆ Px = -25%

Px’ = 800 – 25% (800)

Px’ = 600

Persamaan Garis

Y’ = 𝑀

𝑃𝑦 –

𝑃𝑥′

𝑃𝑦 x

Y’ = 120.000

600 -

600

600 x

Y’ = 200 – X

Jika X = 0 ; Y = 200 (0 ; 200)

Jika Y = 0 ; X = 200 (200 ; 0)

∆ 𝑄𝑦 = 20 𝑢𝑛𝑖𝑡

𝑄𝑦′ = 100 + 20

Qy’ = 120 unit

Py = Rp.600

Px = Rp.800

Qx’ = 𝑀−𝑄𝑦′𝑃𝑦

𝑃𝑥′

Qx’ = 150.000 −120(600)

600

Qx’ = 80 unit

𝐸1 = (80 ; 120)

c. Termasuk barang normal karena harga turun permintaan barang meningkat.

Keadaan konsumen lebih baik karena E1 berada di sebelah kanan E0

d. Dik : ∆𝑀 = −15.000

M’ = 120.000 – 15.000

M’ = 105.000

Dik : ∆Py = -100

Py’ = 600 – 100 = 500

Dik : ∆Qy = 30 unit

Qy”= 120 + 30 = 150

Qx”= 𝑀 –𝑄𝑦"(𝑃𝑦′)

𝑃𝑥′

Qx”= 105.000 −150(500)

600

Qx”= 50 unit

Persamaan Garis

Y” = 𝑀′

𝑃𝑦′ –

𝑃𝑥′

𝑃𝑦′ x

Y” = 105000

500 –

600

500 x

Y” = 210 - 6

5 x

Jika X = 0 ; y = 210 (0 ; 210)

Jika Y = 0 ; x = 175 (175 ; 0)

𝐸2 = (50 ; 150)