We were asked to design digital voltage and current meter with 3 ranges (20 100 200) v for voltages and two ranges (2, 20)A for amperes Note: supply voltage is 5V maximum value for resistors of ampere meter must not exceeded 0.5 ohm V1=Vin. (R2+R3+R4)/(R1+R2+R3+R4) V2=Vin.(R3+R4)/(R1+R2+R3+R4) V3=Vin.(R4)/(R1+R2+R3+R4) Where V1=V2=V3=V4=1 V Vin changes respectively with V1,V2,V3 as 20,100,200 So we used those equations mentioned above when we considered R1+R2+R3+R4=6000 Kohm but we get these values: R4=R3=30Kohm R2= -30 Note: we have no problem with current meter,that's why I haven't referred to it at the attachment Need help! Thanks in advance!