Answer :
1500 = MD as M = 1000 and D = 500
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For information:
I = 1 V = 5 VI = 6
IX = 9 X = 10 XI = 11
XL = 40 L = 50 LI = 51 LXII = 62
C = 100 CI = 101
D = 500 DI = 501
MDC = 1600
=====================================
For information:
I = 1 V = 5 VI = 6
IX = 9 X = 10 XI = 11
XL = 40 L = 50 LI = 51 LXII = 62
C = 100 CI = 101
D = 500 DI = 501
MDC = 1600