Here, p=45 cents, Pp =29 cent per pound and Q is 1,375.
Q=1200-9.5P+16.2Pp+0.2Y
Putting all the values in the equation
1375=1200-9.5(45)+16.2(29)+0.2Y
1375=1200-427.5+469.8+0.2Y
1375=1242.3+0.2Y
1375-1242=0.2Y
133=0.2Y
Y=133/0.2
Y=665
Now keeping P and Pp constant, assume that the income increased by 1%
So New Y= 665+ 1%(665)
New Y=665+6.65
New Y=671.65
New Q= 1200-9.5(45)+16.2(29)+0.2(671.65)
New Q=1200-427.5+469.8+134.33
New Q=1376.63
New Q is 1376.63 while Originally Q was 1375
Hence New Q is 0.118% more than Original Q. [(1376.63-1375)/1375]
hence income elasticity of Income = percentage change in qty demanded/percentage change in income
Hence, Income elasticity is = 0.118
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