Total mangoes = 25

Unripe mangoes = 7

Ripe mangoes = 25 - 7 = 18

Percentage is calculated by the formula below:

Substiting the number of ripe mangoes and the total mangoes into the percentage formula

Cancel the ones which can cancel out

Percentage of ripe mangoes = 18 x 4 = 72

Hence 72% of the mangoes are ripe

ALTERNATIVELY

You can as well calculate the percentage of the unripe mangoes and subtract it from 100% to get the percentage of the ripe mangoes

Total mangoes = 25

Unripe mangoes = 7

Substiting the number of unripe mangoes and the total mangoes into the percentage formula

Cancel the ones which can cancel out

Percentage of unripe mangoes = 7 x 4 = 28%

Percentage of ripe mangoes = 100% - 28% = 72%

Amount paid = Daily wage x Number of days

Daily wage before increase = GH₵ 25.00

Method I

Finding the 10% increased and adding it to the original wage

10% of GH₵ 25.00 = $\frac{10}{100}$ x GH₵ 25.00 = GH₵ 2.50

Daily wage after increase = GH₵ 25.00 + GH₵ 2.50 = GH₵ 27.50

Amount paid = GH₵ 27.50 x 30 = GH₵ 825.00

Method II

Using 110% as new daily wage percentage

100% represents the original wage.

Daily new wage % = 100% + 10% = 110%

Daily new wage = 110% of GH₵ 25.00

Daily new wage = $\frac{110}{100}$ x GH₵ 25.00 = GH₵ 27.50

Amount paid = GH₵ 27.50 x 30 = GH₵ 825.00