State the Underlying Type of the Following Expressions

State the underlying type of the following expressions:
(a) "hello"
(b) 36
(c) 36.00
(d) 3.6e1
(e) 36 + 69
(f) 36.00 + 69.00
(g) 3.6e1 + 6.9e1
(h) 36 + 69.00
(i) 3.6e1 + 69
(j) 36.00 + 6.9e1
(k) "abc" + "def"
(l) "36" + 69.00
(m) "abc" < "def"
(n) 1 < 2
(o) 1 < 2.0
(p) "abc" < 2