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Direction: Study the following table carefully and answer the questions based on it.

The following table shows the production of minerals for some years as given.

 
Production (In thousand tonnes)

Year  Aluminium Lead Nickel Copper Mica Zinc Iron-ore
1990-91 200 48 226 222 56 94 1100
1991-92 248 112 232 310 68 98 1120
1992-93 306 160 238 298 60 108 1122
1993-94 364 126 248 288 76 96 1132
1994-95 410 188 246 314 84 114 1116
1995-96 560 208 278 328 100 110 1124
1996-97 620 234 368 372 92 120 1142

 

1
What is the average annual production of aluminium from 1990 – 91 to 1996 – 97 ?
» Explain it
A
Average annual production of aluminium

=    200 + 248 + 306 + 364 + 410 + 560 + 620
7

=   386.86 thousands tonnes


Hence, option A is correct.

2
For which metal the increase in the production of that metal is maximum than the previous year.
» Explain it
B
In aluminium production increase is maximum then previous year is 94 - 95 to 95 - 96 increase

=   560 - 410

=   150 thousand tonnes.


Hence, option B is correct.
 
3
The total production of all minerals in 1990 – 91 is increased by 25% than 1989 – 90. While the production of cooper in 1989 – 90 is 15% of the total production in 1989 – 90. What is the approximate production of cooper in 1989 – 90.
» Explain it
A
Total production of minerals in 1991

=   200 + 48 + 226 + 222 + 56 + 94 + 1100

=   1946

 
Production of minerals in 1989 – 90

=    1946  × 100 = 1556.8
125


Production of copper in 1989 - 90
 
=    1556.8 × 15  
100

=   232.52

=   234 thousand tonnes (approx.)


Hence, option A is correct.

4
The production of Nickel in 1990 – 91 is what per cent to the production of Nickel in 1996 – 97
» Explain it
E
% production of Nikil in 1990 - 91 against 96 - 97

=    226  × 100 = 61.4%
368


Hence, option E is correct.

5
The production of iron ore in 1990 – 91 is that per cent to the average of total production of iron ore?
» Explain it
D

Total production of Iron ore

=   1100 + 1120 + 1122 + 1132 + 1116 + 1124 + 1142

=   7856


Average production of Iron ore

=    7856
7

=   1122.28 Production of Iron ore in 1990 - 91

=   1100
 

% Production =  1100  × 100 = 98%
1122.28


Hence, option D is correct.

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