tolongin ya temen2 dengan caranya ada 2 soal

4) R/TR = 80Q - 2Q²
TR = P × Q
P = TR/Q = (80Q - 2Q²)/Q
P = 80 - 2Q
e = 1/P' × P/Q
-4 = 1/-2 × (80-2Q)/Q
-4 = (80-2Q)/-2Q
-4(-2Q) = 80 - 2Q
8Q = 80 - 2Q
10Q = 80
Q = 8
MR adalah turunan dari TR
MR = 80 - 4(8) = 80 - 32 = 48

5) Qd = -2P + 1000
P = 200
Q' = -2
Q = -2(200) + 1000 = 600
e = Q' × P/Q = -2 × 200/600 = -4/6 = -2/3 = 2/3

4. TR = 80Q - 2Q²
    TR = P x Q
    P   = [tex] \frac{TR}{Q} [/tex]
    P   = [tex] \frac{80Q - 2Q²}{Q} [/tex]
    P   = 80 - 2Q
    P'  = -2

    e   = [tex] \frac{P}{Q} [/tex] x [tex] \frac{1}{P'} [/tex]
   -4   = [tex] \frac{80 - 2Q}{Q} [/tex] x [tex] \frac{1}{-2} [/tex]
   -4   = [tex] \frac{80 - 2Q}{-2Q} [/tex]
   8Q  = 80 - 2Q
  10Q = 80
      Q = 8

   MR = TR'
   MR = 80Q - 2Q²
          = 80 - 4Q
   MR = 80 - 4(8) 
          = 80 - 32 = 48

5. Qd = -2P + 1000
      P = 200
    Qd = -2(200) + 1000
          = -400 + 1000 
          = 600

      Q' = -2
       e = [tex] \frac{P}{Q} [/tex] x Q'
          = [tex] \frac{200}{600} [/tex] x -2
          = [tex] \frac{1}{3} [/tex] x -2
          = -[tex] \frac{2}{3} [/tex]