robert ' s salary was decreased by 70 % and subsequently increased by 70 % . how much percentage does he lose ?
n0 = 70.0
n1 = 70.0
t0 = n0 + 100.0
t1 = 100.0 * 100.0
t2 = 100.0 - n0
t3 = t0 * t2
t4 = t1 - t3
t5 = t4 / t1
answer = t5 * 100.0
print(answer)