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হোম›নবম-দশম শ্রেণি›English Version›Mathematics›Equations in One Variable›C-05-Q075

C-05-Q075mediumsingle_mcq

A merchant invested Tk. $5600$ , getting $5\%$ on part and $4\%$ on the rest. Total profit is Tk. $256$ . Money at $5\%$ is—

aTk. $x$
bTk. $2400$
cTk. $1600$
dTk. $4000$

ব্যাখ্যা

Let Tk. $x$ earn $5\%$ ; then $0.05x+0.04(5600-x)=256$ , which simplifies to $0.01x=32$ , giving $x=3200$ . So Tk. $3200$ was invested at $5\%$ .

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