Compare the prices of cars A, B, C, and D based on the provided figures.

Car A price = ₹ 15,30,000
Car B price = ₹ 15,28,500
Since $15,30,000 > 15,28,500$, we have:

a) Car A $>$ Car B

Car B price = ₹ 15,28,500
Car C price = ₹ 21,09,000
Since $15,28,500 < 21,09,000$, we have:

b) Car B $<$ Car C

Car D price = ₹ 21,90,000
Car C price = ₹ 21,09,000
Since $21,90,000 > 21,09,000$, we have:

c) Car D $>$ Car C

Car B price = ₹ 15,28,500
Car D price = ₹ 21,90,000
Since $15,28,500 < 21,90,000$, we have:

d) Car B $<$ Car D

The final comparisons are:

a) Car A $\boxed{>}$ Car B

b) Car B $\boxed{<}$ Car C

c) Car D $\boxed{>}$ Car C

d) Car B $\boxed{<}$ Car D