Solution:-
From the question it is given that,
Pooja invested ₹ $20,000$ and ₹$25,000$ in buying of ‘BT’ and ‘SI’.
Then, ‘BT’ which declared dividend of $10%$ $=(10×20,000)/100=₹2,000$
‘S I ‘ which declared dividend of $12.5%=(12.5×25,000)/(10×100) =₹3,125$
So, money earned by selling shares of ‘BT’ $=(20,000–4%of₹20,000)$
$=₹20,000–800$
$=₹19,200$
Money earned by selling shares of ‘SI’$=(25,000–5%of₹25,000)$
$=₹25,000–1250$
$= ₹23,750$
Therefore, total money earned by selling shares $=₹19,200+₹23,750$
$= ₹42,950$
Then, total earning = money earned by selling shares + dividends earned
$=₹(42,950+5,125)$
$= ₹48,075$
Hence, Pooja’s earnings from the transaction $= ₹(48,075–45,000)$
$= ₹3,075$