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?
Derek doubles his allowance savings each month, so in May, Derek has $16 * 2 = $<<16*2=32>>32.
In June, Derek has $32 * 2 = $<<32*2=64>>64.
In July, Derek has $64 * 2 = $<<64*2=128>>128.
In August, Derek has $128 * 2 = $<<128*2=256>>256.
In September, Derek has $256 * 2 = $<<256*2=512>>512.
In October, Derek has $512 * 2 = $<<512*2=1024>>1024.
In November, Derek has $1024 * 2 = $<<1024*2=2048>>2048.
By December, Derek has $2048 * 2 = $<<2048*2=4096>>4096 to save.
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