Answer:
2 bicycles costs 35,000 each
This means that 1 bicycle costs 35,000
He sells one at a profit of 20%
20/100 ×35000 + 35000
7000+35000
=42,000
How much should he sell the other bicycle to make a profit of 28% on both bicycles
28/100× 35,000
=9,800
Remember that the profit on the first bicycle was 20% which was equal to 7000
and now the trader's goal is to make a profit of 28% on both bicycles
remember that the cost of both bicycles is 35,000+35,000
=70,000
so 28% ×70,000
= 19,600
So, to get the profit he needs to add to the second bicycle
19,600-7000
= 12,600
Now, add 12,600 to 35,000
= 47,600
The trader should sell the other bicycle for 47,600 to make a profit of 28% on whole.