A group of women planned to raise Sh. 12000 for charity. However, five more women joined the group. If the contribution per person decreased by Sh. 100, find the original number of women.

Here's a step-by-step solution to the problem based on the image provided:

Let $x$ be the original number of women in the group.
The total amount to be raised is Sh. 12000.

a) Write the expression for the original contribution per person.
If there are $x$ women and they need to raise Sh. 12000, the original contribution per person is the total amount divided by the number of women.

$$\text{Original contribution per person} = \frac{12000}{x}$$

The expression for the original contribution per person is $\boxed{\frac{12000}{x}}$.

*b) Write an expression for the contribution per person after five