Identify the cost price and profit.

• Cost of sugar: $2 \text{ kg} \times \text{sh. } 140/\text{kg} = \text{sh. } 280$
• Cost of wheat flour: $1 \text{ packet} \times \text{sh. } 170/\text{packet} = \text{sh. } 170$ (assuming 2.2 kg packet is one unit)
• Cost of cooking oil: $2 \text{ litres} \times \text{sh. } 320/\text{litre} = \text{sh. } 640$
• Cost of soap: $3 \text{ bars} \times \text{sh. } 120/\text{bar} = \text{sh. } 360$

He paid $\boxed{\text{sh. } 1450}$ for the items.

Amount Paid = $2 \times \text{sh. } 1000 = \text{sh. } 2000$

Balance = Amount Paid - Total Cost

He received a balance of $\boxed{\text{sh. } 550}$.

29.

The angles $20^\circ$, $80^\circ$, and $m$ are adjacent angles on a straight line.
The sum of angles on a straight line is $180^\circ$.

The value of angle $m$ is $\boxed{80^\circ}$.