Use the depreciation formula.

Where 'p' is the principal value, 'r' is the rate it depreciates, and 'n' is the time. Just plug in what we know:

Simplify by subtracting:

Simplify the exponent:

Multiply:
Is this all the problem wants ?
You divide 6 from both sides which gives you x=g/6
Answer:
Potato
Step-by-step explanation:
1 kg = 1000 g
Assuming the potatoes have the same mass, and the pears have the same mass, then the mass of each potato is:
1000 g / 5 = 200 g
And the mass of each pear is:
1200 g / 8 = 150 g
So a potato has more mass than a pear.