Question

What is the growth rate of sales of books at primary school level from 1975 to 1980?

• A. 29%
• B. 51%
• C. 63%
• D. 163%
• A. Primary
• B. Secondary
• C. Higher secondary
• D. Graduate Level
• A. Primary
• B. Secondary
• C. Higher secondary
• D. Graduate Level
• A. Primary
• B. Secondary
• C. Higher secondary
• D. Graduate Level

Answer 1

The Correct Option is C

We are given:
Primary sales in 1975 = $42137$
Primary sales in 1980 = $68718$
Formula for growth rate:
\[ \text{Growth Rate} = \frac{\text{Final} - \text{Initial}}{\text{Initial}} \times 100 \]
Substituting:
\[ \text{Growth Rate} = \frac{68718 - 42137}{42137} \times 100 \]
\[ = \frac{26581}{42137} \times 100 \]
Now, divide:
$26581 \div 42137 \approx 0.6308$
Multiply by 100:
$0.6308 \times 100 \approx 63.08%$
Thus, the growth rate is approximately $63%$.
Checking incorrect options:
(A) 29% — much lower than the calculated value, hence incorrect.
(B) 51% — also lower than the exact 63%, so incorrect.
(D) 163% — would imply the sales more than doubled, which is far from the actual increase.
\(\boxed{\text{Correct Answer: (C) 63%}}\)

Answer 2

We calculate growth rate for each category:
Primary: Initial = $42137$, Final = $68718$
Growth = $\frac{68718 - 42137}{42137} \times 100 \approx 63.08%$
Secondary: Initial = $8820$, Final = $20177$
Growth = $\frac{20177 - 8820}{8820} \times 100 \approx 128.74%$
Higher Secondary: Initial = $65303$, Final = $82175$
Growth = $\frac{82175 - 65303}{65303} \times 100 \approx 25.87%$
Graduate: Initial = $25343$, Final = $36697$
Growth = $\frac{36697 - 25343}{25343} \times 100 \approx 44.85%$
Clearly, the smallest growth is $25.87%$ for Higher Secondary.
Checking incorrect options:
(A) Primary — $63.08%$, higher than $25.87%$.
(B) Secondary — $128.74%$, the highest growth rate, so incorrect.
(D) Graduate — $44.85%$, larger than $25.87%$.
\(\boxed{\text{Correct Answer: (C) Higher secondary}}\)

Answer 3

From previous calculations:
Primary: $63.08%$
Secondary: $128.74%$
Higher Secondary: $25.87%$
Graduate: $44.85%$
Highest is clearly Secondary with $128.74%$ growth.
Checking incorrect options:
(A) Primary — only $63.08%$, much lower.
(C) Higher Secondary — $25.87%$, the smallest growth rate, not the largest.
(D) Graduate — $44.85%$, also smaller than $128.74%$.
\(\boxed{\text{Correct Answer: (B) Secondary}}\)

Answer 4

We examine year-by-year for each category:
Primary: 42137 $\rightarrow$ 53568 (up) $\rightarrow$ 58770 (up) $\rightarrow$ 56872 (down) — break in trend.
Secondary: 8820 $\rightarrow$ 10285 (up) $\rightarrow$ 16437 (up) $\rightarrow$ 15475 (down) — break in trend.
Higher Secondary: 65303 $\rightarrow$ 71602 (up) $\rightarrow$ 73667 (up) $\rightarrow$ 71668 (down) — break in trend.
Graduate: 25343 $\rightarrow$ 27930 (up) $\rightarrow$ 28687 (up) $\rightarrow$ 30057 (up) $\rightarrow$ 33682 (up) $\rightarrow$ 36697 (up) — consistent growth every year.
Thus, only Graduate Level has consistent growth.
Checking incorrect options:
(A) Primary — one year shows a drop, so not consistent.
(B) Secondary — also has a drop.
(C) Higher Secondary — has a drop after 1977.
\(\boxed{\text{Correct Answer: (D) Graduate Level}}\)