Carlos is saving up to buy two new books. he had saved 60% of the cost of one book that cost $18, and 30% of the cost of another book that cost $21. how much more does he need to save?

So he needs to save on the first book 40% and the second one 60% i hope i helped

Find how much he has for the first book by multipling .60 by 18: .6•18=10.80. Find how much he still needs by subtracting 10.8 from 18: 18-10.8=7.20.

For the second one multiply .30 by 21: .3•21=6.3. Subtract 6.3 from 21: 21-6.3=14.70.

Now to find how much he still needs to save add 14.70 and 7.20: 14.7+7.2=21.9.

Carlos still needs $21.90 :)