sketcha
here's my take on these. a 7" x 25 = 175" i just noticed there is no division sign on the key board, along with no cent sign, who designed this keyboard.
anyway, that's 8 cents an inch. a 7 X 47 should last about an hour, unless you ae a quick sucker. @ $.56 (i don't need no stinking cents sign) what else would give you more pleasure for $.56 an hour?
and forget what you are thinking, you can't last an hour.