Question

Two variables P and Q has values 30±2 and 10.0 respectively, calculate the percentage error in the following (i) PQ (ii) P2 (iii)

Answer 1

$$PQ=(30\pm2)10=300\pm20,\\\space\\ \epsilon=\frac{20}{300}\cdot100\%=6\%.$$

$$P^2=100,\\ \epsilon=\frac{0}{100}\cdot100\%=0.$$