Word Problems K8Large individual letters are differently priced.

The letters in the word SPRING cost $19.
The letters in the word SUMMER cost $20.
The letters in the word AUTUMN cost $21.
The letters in the word WINTER cost $20.

How much would the letters in the word SEASONS cost?

There is insufficient information to solve this problem.
Use the simplest assumption which exactly matches one of the answers given below.