Derek finally gets his own allowance. He puts $2 away in January, $4 away in February, $8 away in March, $16 away in April and follows this savings pattern through to December. How much money does he have to spare and save by December?
How much money does Derek have in May? ** Derek doubles his allowance savings each month, so in May, Derek has $16 * 2 = $<<16*2=32>>32.
How much money does Derek have in June? ** In June, Derek has $32 * 2 = $<<32*2=64>>64.
How much money does Derek have in July? ** In July, Derek has $64 * 2 = $<<64*2=128>>128.
How much money does Derek have in August? ** In August, Derek has $128 * 2 = $<<128*2=256>>256.
How much money does Derek have in September? ** In September, Derek has $256 * 2 = $<<256*2=512>>512.
How much money does Derek have in October? ** In October, Derek has $512 * 2 = $<<512*2=1024>>1024.
How much money does Derek have in November? ** In November, Derek has $1024 * 2 = $<<1024*2=2048>>2048.
How much money does Derek have to spare and save by December? ** By December, Derek has $2048 * 2 = $<<2048*2=4096>>4096 to save.
#### 4096