1. Intermediate Math for Economics 2014-15
Quiz I
Intermediate Math for Economics

2. Preparation Write your name and NIM Closed your book No cheating
Time 30 minutes
1/17/2019

3. Grade
Right Number
Wrong Number
Grade 3 D 1 2 C B A
1/17/2019

4. No. 1
Given the demand function P = 200 − Q calculate the price elasticity of demand when the price is 30 Is the demand inelastic, unit elastic or elastic at these prices?
1/17/2019

5. No. 2
Determine the elasticity of demand when the price falls from 190 to 183, given the demand function P = 400 − Q2
1/17/2019

6. No. 3
Given the supply function P = 30 + Q find the price elasticity of supply averaged along an arc between Q = 100 and Q = 105
1/17/2019

7. Stop !!
1/17/2019

8. JAWABAN SOAL NO.1
P = 200 – Q P – 200 = - Q Q = 200 – P E = -P/Q x dQ/dP E = -30/170 x (-1) E = 0,17 Karena E kurang dari 1 maka inelastic.
1/17/2019

9. JAWABAN SOAL NO.2
P1 = 190 P2 = 183 P = 400 – Q2 190 = 400 – Q2 Q2 = Q2 = 210 Q1 = 14,50 Q2 = Q2 = 217 Q2 = 14,73 dP = 183 – 190 dP = -7 dQ = 14,73 – 14,50 dQ = 0,23 P = ½ ( ) P = 186,5 Q = ½ (14,50+14,73) Q = 14,6 E = -P/Q x dQ/dP E = 0,42 (inelastic)
1/17/2019

10. JAWABAN SOAL NO.3
P = 30 + Q Q1 = 100 Q2 = 105 P1 = P1 = 130 P2 = P2 = 135 dP = 5 dQ = 5 P = 132,5 Q = 102,5 E = P/Q x dQ/dP E = 1,29 (elastis)
1/17/2019