Solution
Expression : (42% of 7200) - (12% of 4800)
= $$(\frac{42}{100}\times7200)-(\frac{12}{100}\times4800)$$
= $$(42\times72)-(12\times48)$$
= $$(12\times12)(21-4)$$
= $$144\times17=2448$$
=> Ans - (B)
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