A laboratory has a budget cap of ₹300 for buying one thermometer to measure a temperature rise of about 5.0 °C. The measurement must have a percentage uncertainty not exceeding 1.0 %. Which thermometer should be purchased?
a) Digital thermometer: least count 0.01∘C, cost ₹600
b) Mercury thermometer: least count 0.05∘C, cost ₹280
c) Alcohol thermometer: least count 0.1∘C, cost ₹150
d) Thermocouple read-out: least count 0.05∘C, cost ₹350