Solve this for me in English

This is the revenue Mr. Onyango will gain by planting potatoes on $0.3 \text{ ha}$.

• Potato yield per hectare: $90 \text{ bags}$
• Potato yield for $0.3 \text{ ha}$: $90 \text{ bags/ha} \times 0.3 \text{ ha} = 27 \text{ bags}$
• Price of potatoes per bag: Ksh 300

$$\text{Added Returns} = 27 \text{ bags} \times \text{Ksh } 300/\text{bag} = \text{Ksh } 8100$$

These are the costs Mr. Onyango will save by not planting maize on $0.3 \text{ ha}$.

• Maize Fertilizer:
  • Maize fertilizer rate: $2 \text{ bags/ha}$
  • Maize fertilizer for $0.3 \text{ ha}$: $2 \text{ bags/ha} \times 0.3 \text{ ha} = 0.6 \text{ bags}$
  • Cost of fertilizer (50kg): Ksh 1400
  $$\text{Reduced Fertilizer Cost} = 0.6 \text{ bags} \times \text{Ksh } 1400/\text{bag} = \text{Ksh } 840$$
• Maize Seeds:
  • Maize seeds needed for $0.3 \text{ ha}$: $1 \text{ bag}$
  • Cost of maize seeds (50kg): Ksh 200
  $$\text{Reduced Seed Cost} = 1 \text{ bag} \times \text{Ksh } 200/\text{bag} = \text{Ksh } 200$$

$$\text{Total Reduced Costs} = \text{Ksh } 840 + \text{Ksh } 200 = \text{Ksh } 1040$$

These are the new costs Mr. Onyango will incur for planting potatoes.

• Potato Fertilizer:
  • Potato fertilizer rate: $2.5 \text{ bags/ha}$
  • Potato fertilizer for $0.3 \text{ ha}$: $2.5 \text{ bags/ha} \times 0.3 \text{ ha} = 0.75 \text{ bags}$
  • Cost of fertilizer (50kg): Ksh 1400
  $$\text{Added Fertilizer Cost} = 0.75 \text{ bags} \times \text{Ksh } 1400/\text{bag} = \text{Ksh } 1050$$
• Potato Seeds:
  • Potato seeds needed for $0.3 \text{ ha}$: $10 \text{ bags}$ (of 10kg)
  • Cost of potato seeds per bag (10kg): Ksh 1350
  $$\text{Added Seed Cost} = 10 \text{ bags} \times \text{Ksh } 1350/\text{bag} = \text{Ksh } 13500$$
• Extra Labour:
  • Extra labour days per hectare: $40 \text{ days/ha}$
  • Extra labour days for $0.3 \text{ ha}$: $40 \text{ days/ha} \times 0.3 \text{ ha} = 12 \text{ days}$
  • Cost of labour per day: Ksh 150
  $$\text{Added Labour Cost} = 12 \text{ days} \times \text{Ksh } 150/\text{day} = \text{Ksh } 1800$$

$$\text{Total Added Costs} = \text{Ksh } 1050 + \text{Ksh } 13500 + \text{Ksh } 1800 = \text{Ksh } 16350$$

This is the revenue Mr. Onyango will lose by not planting maize.

• Maize yield per hectare: $56 \text{ bags}$
• Maize yield for $0.3 \text{ ha}$: $56 \text{ bags/ha} \times 0.3 \text{ ha} = 16.8 \text{ bags}$
• Price of maize per bag: Ksh 1200

$$\text{Reduced Returns} = 16.8 \text{ bags} \times \text{Ksh } 1200/\text{bag} = \text{Ksh } 20160$$

Partial Budget for Changing 0.3 ha of Maize to Potatoes

Item	Amount (Ksh)
A. Added Returns
Returns from Potatoes (0.3 ha)	8100
Total Added Returns	8100
B. Reduced Costs
Maize Fertilizer Saved (0.3 ha)	840
Maize Seeds Saved (0.3 ha)	200
Total Reduced Costs	1040
C. Added Costs
Potato Fertilizer (0.3 ha)	1050
Potato Seeds (0.3 ha)	13500
Extra Labour (0.3 ha)	1800
Total Added Costs	16350
D. Reduced Returns
Lost Returns from Maize (0.3 ha)	20160
Total Reduced Returns	20160
Net Change in Profit (A+B)-(C+D)	-27370

The effect of the change is a decrease in profit of Ksh 27,370.

$$\boxed{\text{Net Change in Profit} = \text{Ksh } -27370}$$