The errors are:
〖∆R_1=R(∆R/R)〗_1=0.1(1)=0.1
〖∆R_2=R(∆R/R)〗_2=0.05(2)=0.1
〖∆R_3=R(∆R/R)〗_3=0.033(3)=0.099
〖∆R_4=R(∆R/R)〗_4=0.025(4)=0.1
〖∆R_5=R(∆R/R)〗_5=0.02(5)=0.1
The error is ∆R/R= 0.033.