If productCost and productPrice are numeric variables, and productName is a string variable, which of the following statements are valid assignments? If a statement is not valid, explain why not.

a. productCost = 100

b. productPrice = productCost

c. productPrice = productName

d. productPrice = "24.95"

e. 15.67 = productCost

f. productCost = $1,345.52

g. productCost = productPrice - 10

h. productName = "mouse pad"

i. productCost + 20 = productPrice

j. productName = 3-inch nails

k. productName = 43

l. productName = "44"

m. "99" = productName

n. productName = brush

o. battery = productName

p. productPrice = productPrice

q. productName = productCost