The selling price of 16 books is equal to the cost price of 8 books. Find the loss or gain percentage.

The selling price of 16 books is equal to the cost price of 8 books. Find the loss or gain percentage.
16 पुस्तकों का विक्रय मूल्य 8 पुस्तकों के क्रय मूल्य के बराबर है। लाभ या हानि प्रतिशत ज्ञात कीजिए।

$\frac{ 100}{8}$% gain/ $\frac{ 100}{8}$% लाभ 50% gain/ 50% लाभ 50% loss/ 50% हानि $\frac{100}{8}$ %loss/ $\frac{100}{8}$ %हानि