How do microwave ovens work?

Raghav bought 25 washing machines and microwave ovens for Rs. 2,05,000. He sold 80% of the washing machines and 12 microwave ovens for a profit of Rs. 40,000. Each washing machine was marked up by 20% over cost and each microwave oven was sold at a profit of Rs. 2,000. The remaining washing machines and 3 microwave ovens could not be sold. What is Raghav’s overall profit/loss?

Which of the following is correct about microwave oven?

Assertion Microwaves are used in microwave oven for cooking purpose. Reason The frequency of microwaves is from 10^(14) to 10^(17) Hz .

Why dose microwave oven heats up a food item containing water molecules most efficiently?

The device which converts mechanical energy into energy which runs our microwave oven is :

The working of a microwave oven involves