tolong dibantu kakak :)

Kp = K1 + K2 = 100 + 200 = 300N/m
1/ks total = 1/kp + 1/k3 + 1/k4
1/ks total = 1/300 + 1/150 +1/300
1/ks total = 1/300 + 2/300 + 1/300
1/ks total = 4/300
4ks total= 300
ks total = 300/4
ks total = 75 N/m
jadi konstanta pegas gabungan 75 N/m

note : maaf kalo salah.