JAMB - Mathematics (1979 - No. 36)
The size of a quantity first doubles and then increases by a further 16%. After a short time its size decreases by 16%. What is the net increases in size of the quantity?
\(\frac{59300}{625}\)
\(\frac{50900}{625}\)
200%
+100%
คำอธิบาย
Let x rept. the size of the quantity
2x + \(\frac{116}{100}\) x \(\frac{-84}{100}\)
= 200%
2x + \(\frac{116}{100}\) x \(\frac{-84}{100}\)
= 200%