Given:
Volume of prism $V_1 = 960$ cm³
Base area $A = 80$ cm²
New volume $V_2 = 1200$ cm³
Step 1: Original height निकालें
Volume of prism = base area × height
$V_1 = A \times h_1$
$960 = 80 \times h_1$
$h_1 = \frac{960}{80} = 12$ cm
Step 2: New height निकालें
$V_2 = A \times h_2$
$1200 = 80 \times h_2$
$h_2 = \frac{1200}{80} = 15$ cm
Step 3: Height में प्रतिशत वृद्धि निकालें
Percentage increase = $\frac{h_2 - h_1}{h_1} \times 100$
$= \frac{15 - 12}{12} \times 100$
$= \frac{3}{12} \times 100$
Answer / उत्तर:= 25%