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Solution:

Number of Managers working in the Company:

In 2015 = 760.

In 2020 = (760 + 280 + 179 + 148 + 160 + 193) - (120 + 92 + 88 + 72 + 96)= 1252.

Therefore, the Percentage increase in the number of Managers

=\frac{(1252−760)}{760}\times 100\%= 64.74\%

Number of Technicians working in the Company:

In 2015 = 1200.

In 2020 = (1200 + 272 + 240 + 236 + 256 + 288) - (120 + 128 + 96 + 100 +112) = 1936.

Therefore, the Percentage increase in the number of Technicians

=\frac{(1936−1200)}{1200}\times 100\% = 61.33\%

Number of Operators working in the Company:

In 2015 = 880.

In 2020 = (880 + 256 + 240 + 208 + 192 + 248) - (104 + 120 + 100 + 112 + 144) = 1444.

Therefore, the Percentage increase in the number of Operators

=\frac{(1444−880)}{880}\times 100\% = 64.09\%

Number of Accountants working in the Company:

In 2015 = 1160.

In 2020 = (1160 + 200 + 224 + 248 + 272 + 260) - (100 + 104 + 96 + 88 + 92) = 1884.

Therefore, the Percentage increase in the number of Accountants

=\frac{(1884−1160)}{1160}\times 100\% = 62.14\%

Number of Peons working in the Company:

In 2015 = 820.

In 2020 = (820 + 184 + 152 + 196 + 224 + 200) - (96 + 88 + 80 + 120 + 104) = 1288.

Therefore, the Percentage increase in the number of Peons

=\frac{(1288−820)}{820}\times 100\% = 57.07\%

Clearly, the percentage increase is maximum in the case of Managers.