Question

A Furniture dealer earn a profit of rupees

Answer 1

$num \: of \: tables \: \: \: 20 \: \\ num \: of \: chairs \: \: \: 20 \\ profit \: by \: selling \: a \: table \: is \: rupees \: 500 \\ loss \: by \: selling \: a \: chair \: is \: rupees \: 150 \: ......(given)$
$profit \: he \: gain \: in \: tables \: is \: \\ 20 \times 500 = 1000$
$loss \: he \: made \: in \: 20 \: chairs \\ 150 \times 20 = 300$
Hé had make 1000-300=700profit
The b part is not clear!!
Hope it helped you!!!