if you want to communicate vlan 100 to vlan 50 than you will have to configure the router on stick method   

Configuration on R1 router

R1(config)#interface fastEthernet 0/0

R1(config-subif)#no shutdown

R1(config-subif)#exit

R1(config)#interface fastEthernet 0/0.1

R1(config-subif)#encapsulation dot1Q 100

R1(config-subif)#ip address 10.0.0.1 255.255.255.0

R1(config-subif)#no shutdown

R1(config-subif)#exit

R1(config)#interface fastEthernet 0/0.2

R1(config-subif)#encapsulation dot1Q 200

R1(config-subif)#ip address 20.0.0.1 255.255.255.0

R1(config-subif)#no shutdown

R1(config-subif)#exit

R1(config)#ip route 100.0.0.0 255.255.255.0 192.168.1.2

R1(config)#ip route 200.0.0.0 255.255.255.0 192.168.1.2

 

Configuration on R2 router

R1(config)#interface fastEthernet 0/0

R1(config-subif)#no shutdown

R1(config-subif)#exit

R2(config)#interface fastEthernet 0/0.1

R2(config-subif)#encapsulation dot1Q 70

R2(config-subif)#ip address 100.0.0.1 255.255.255.0

R2(config-subif)#no shutdown

R2(config-subif)#exit

R2(config)#interface fastEthernet 0/0.2

R2(config-subif)#encapsulation dot1Q 50

R2(config-subif)#ip address 200.0.0.1 255.255.255.0

R2(config-subif)#no shutdown

R2(config-subif)#exit

R2(config)#ip route 10.0.0.0 255.255.255.0 192.168.1.1

R2(config)#ip route 20.0.0.0 255.255.255.0 192.168.1.1

ping 200.0.0.3