Mr. Lal took a loan of Rs 80,000 to buy a motor bike. He repays his total loan by paying every month starting with the first instalment of Rs 1000. If he increases his instalment by Rs 100 every month, what amount will be paid by him in the $$24^{th}$$ instalment? What amount of loan does he still have to pay after the $$24^{th}$$ instalment?