Nathan bought three books at the Library Lovers Month party. The one about Pluto cost one and 1/2 dollars. The one with pictures of Ferris wheels cost $2.51. The one about Friday the thirteenth cost 1 17/20 of a dollar. How much did he spend in all?
\(1 \frac{1}{2} + 2.51 + 1 \frac{17}{20}\)
\(= 1.50 + 2.51 + 1.85\)
\(= \boxed{\$5.86}\)
.