টাকায় ৫টি মার্বেল বিক্রয় করায় ১২% ক্ষতি হয় । ১০% লাভ করতে হলে টাকায় কয়টি বিক্রয় করতে হবে ?

By selling 32 guavas for Tk. 30 a man loss 25% . How many guavas should be sold for tk. 18 to gain 20% of prof...

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